When I flew from Switzerland to the US, I flew a curve (on mercator maps) over Greenland, which I did not realize before the trip. I actually saw the ice masses below me at once, which was an unexpected, exciting sight.
2:31 "On a polar projection, a great circle track is a straight line." - This is only true if you are traveling on a meridian. In all other cases the path of a great circle on the polar (Equidistant Azimuthal) projection is in fact still a curve. I saw only two other comments mentioning this, but they were buried way down the page, so I thought it worth repeating this small but important point. Other than that, this was an excellent video. Very clear, and pleasantly narrated :) An additional interesting fact: A straight line on a Mercator projection is called a rhumb line or a loxodrome. It is the path you will follow if you stay on the same bearing throughout the journey. Keeping rhumb lines straight is what results in the area distortions at the poles on Mercator. If you are navigating without being able to determine longitude precisely, and using only a compass, the Merrcator map is an invaluable tool, hence it's popularity in older times. Now we have accurate clocks and GPS, and other map projections are gaining popularity.
@@fouadkhattar No, I am just an amateur. For fun I have been playing with programming different map projections on my computer, so I have learned a bit about the topic that way. The real professionals know a lot more than I do :)
Yes, Navigators or Captains do. It's like an added benefit - like when a plane encounters tail wind and it gets to the airport earlier than planned. Same concept.
I've heard a crew of a yacht claiming that they have gained places during a race by anchoring. They noted that they couldn't sail faster then the current they were up against (i.e. effectively going backwards) and dropped anchor. Some of their competition didn't . . . This also had the side effect of allowing them to rest and be more effective when wind and / or currents shifted in more favourable directions. In Aviation the "North Atlantic Tracks" for example are calculated daily to take the most advantage of jetstreams, I'd be surprised if something similar didn't exist in the maritime world, as well . . .
These videos are awesome. They are simplified enough for anyone to understand, but also have enough depth to be interesting to those with a bit more knowledge. I've never had much interest in nautical stuff, but I've been bingeing these all week.
“Because we all know earth is a sphere” Me, who is a minecraft Villager: Nah it a _ＣＵＢＥ_ Edit: because so many people are taking this seriously I have to point out that THIS WAS SUPPOSED TO BE A JOKE
@Miles Dyson I didn't say they did. What are you talking about? Also, water does not truelly level due to surface tension. You can easily see this by placing a small drop of water on your finger. It dosn't sit flat or level but is curved. The larger the body of water the less evident it is.
@Miles Dyson It's not an analogy, it's a small scale experiment demonstrating a principle in physics. Surface tension is a thing and it effects the behavior of fluids. It's how certain insects can "walk" on the water's surface without relying on buoyancy of their body, like a ship, but on the surface tension of water If it helps, take a more viscous fluid like engine oil, especially if cold, pour it into a level contain, wait a bit and comeback and look at it. It dosn't sit perfectly flat in the container. Fluid does level out but it dosn't sit perfectly flat.
@Miles Dyson exactly miles. The water levels out on the curvature of the earth. Now please give me your version of how tides work. I'll just go grab some beer and popcorn first.
It's not that surprising really. Both vessels have to travel over the same distances so the principals of how you make sure you know where your going are more or less the same. The only real difference is the speed at which your are traveling and what happens should you run out of fuel.
That’s not all. The same principle applies to both the wings on an airplane and the rudder. Also, I’m not sure about this one, but I guess airplanes use red lights for PS and green for SB? Can anyone confirm?
@@alexengler486 That is correct. Aircraft use the same red PS/green SB markers as Ships. Also uses nautical miles and Knots in navigation and speed. Basically an airplane is a 3 dimensional boat. The air moves just like water. only less dense.
I really enjoy watching your videos, even though I am more a plane than a ship person, just because planes taxi 20 kts on the ramp and ships go 20 kts over the sea ;) But it is really interesting to see that 90% of the stuff you explain in your videos could be put 1:1 into aviation. Maritime and Aviation are just best friends :)
Thank you I am an out of date sailor I haven't sailed a yacht now since 03 and then it was done through the Islands off of Dubrovnik So was in the Med therefore sailing the easy way My Dad taught me to sail in a Mirror dinghy on a manmade pond then the River Thames and finally the English Channel through my own efforts I went on to the East and South sailings (to foreign shores) Sorry I'm rambling You have awoken me to actually get round to doing my official courses ;-))
In the 70s I had to learn navigation to pass a charter license for my dad's boat. They pointed out if you didn't account for the curvature if you left California for Hawaii you'd miss by a couple hundred miles. We just ran coastal so it wasn't a big deal.
You are a bit muddled there. There is no curvature to account for. You go from one to the other along a straight line, ignoring currents and winds for the sake of the argument. You would use a gnomic chart that would show your course as a straight line, and not a Mercator. For short voyages Mercator charts are fine, but a trans ocean, as you suggest needs a gnomic too.
@@geraldlrstubbs No I don't think so, the Mercator was sufficient as it worked to keep us 250 miles off the Nicaraguan coast and outside their jurisdiction. It apparently did not make any difference to them as they attempted to board us and we out-ran their 33 foot open twin outboards in a sea too heavy for their unseaworthy skiff. What a joke, probably pirates. They fired across our bow and really pissed me off, but my dad wouldn't let me return fire.
It'd be great to have a video explaining, with your amazing clarity, how bearings are read and understood. At some point you said: "...bearing of 0-9-0...", this is what I'm refering to. My apologies if you already made one, will have to look it up :-) Thanks a lot for another great video!
We say 090 so three digits are used. If we just say 90 it is possible that we actually said 190 but 1 was not heard. 100 degrees off course and in big trouble.
I remember seeing Antarctica and the Arctic in 2 circles on one of those large classroom maps, and I spent a good while trying to locate these 2 locations on the map for a while, before I realised they were supposed to show the North and South poles...
On a small vessel wind and current tend to move a vessel off course, so constant corrections are needed to maintain a course that will get you to your destination. This also results in a curve track.
Any possibility you might do a video on creating ocean routes, charting courses manually, and how this was done in the olden days before electronic systems? I'd find the history and math involved in seafaring navigation to be interesting.
I just found your channel about 3 mouths ago and I love the content and the videos. Before I found This channel I didn’t know much about ships but know I feel like I could teach others about the topic. Not saying I want to steal your teachings and pass it off as mine but I mean the way you teach about it is simple enough to understand.
The essential difference is that with planes, they don't care if they are flying over land or water, and can always take the great circle route as long as there are no countries with overfly restrictions in the way. Ships also have to navigate around the choke points created by land. There are only two parts of the world that are "natural no-fly zones" for planes without a destination there, which are Tibet and Antarctica. Antarctica, because of the lack of contingency airports along the way, and not enough customer-demand for large enough planes to fly the routes that could fly the long hauls that would cross Antarctica. And Tibet/The Himalayas, because the high elevation of the land, gives no margin of error for diving the plane in an emergency descent when it loses cabin pressure.
Yeah I had some friends who flew from England to San Francisco, and their mind they just imagined they were flying west, so they couldn’t understand why the pilots told them they were coming in over the Arctic in northern Canada because it can be really hard to conceptualise navigating on the spherical surface.
I'm more confused the more you explain. 😭 I should have stopped watching when I realized the main point was that the Earth was curved. Stupid geometry still haunts me.
@@ravishankarprabhu2423 our sense of standing up and down is due to gravity. The fluid in the ear gives you the sense of what is up and down. Gravity is what's pushing the fluid down hence you know you are standing straight. Wherever you go on the earth, the gravity acts normal to the surface
Nice video Sir, really nice. We need to educate our children more in geography, navigation, and basic mathematic principles and you are doing your part. If I can expand to define a ‘great circle’ (aka orthodrome) in lay terms it’s very easy to understand without going into complex mathematical proofs. A great circle is really just any circumference line on a sphere. Think of it as taking the equator line and moving it to different positions on the globe. Just line up that line to connect any two points and essentially you have a ‘great circle’ drawn. What’s truly astounding is this geographical, mathematical, cartographical, and navigational principles and knowledge was developed by men using eye, ink, quill, and abacus. From ignorance and darkness, they brought light to what was previously unknown. True genius! We truly see further because we sit upon the shoulders of these giants. To think these men are now disparaged as ‘racist’ or ‘patriarchal misogynists’ or whatever... Sorry, it seems I went political but this type of classical education is forgone to instead indoctrinate children in identity politics and other anti classical liberal pursuits. It’s sad, we are denying children their innate sentience and capacity for reason, and their western civilization intellectual birthright to instead advance partisan causes which will only serve to further eradicate true education from our children.
White westerners have no monopoly on genius. Nor do all of the ideas which shape the modern world originate in the west. Nor do all of the basic tools which are required to make everything work. I am quite certain that neither the decimal numbering system nor the alphabet now used in places like the US or the UK originated in the west. Nor did the concept of zero. The Pythagorean theorem has been found on clay tablets out of ancient Mesopotamia at least 1500 years before the age of the Greek city states. "Identity politics" was okay when white explorers, adventurers and settlers designed and imposed a racial hierarchy on the parts of the globe which they managed to conquer and/or colonize. But now, when that paradigm is challenged, it's a problem? For whom? Let's not pretend that "once upon a time" a pure, non ideological, and merit based "education" system existed in the US or anyplace else for that matter. Indoctrination has always been omnipresent in many forms ranging from the way the histories and contributions of many societies are disappeared and the way massive wrongs and injustices both past and ongoing are either white washed, justified, or not studied at all, unless those in power can score points or claim some sort of moral authority by doing so.
2:30 on a polar projection you also get distortions. the straight line plots the shortest route only if it goes over the north pole. for a boundary condition, take a polar projection and draw a straight line between two points on the equator. that will obviously not be shortest route. in order to be able to draw a straight line as the shortest route, you would need a polar projection with a centre of the projection not at the north pole, but actually on the shortest route. similarly, if you have a custom mercador projection with a 'projection equator' (i.e. the circle on the surface of the sphere that does not get stretched in the projection) not on the earth's equator, but rather passing through the route start and finish, then the route will be as straight line.
@Jon Goat Not really. Nobody of importance thinks the Earth is flat. The falt Earthers are a vocal minority. An extraordinarily loud, extraordinarily stupid minority.
@@magisterrleth3129 No, they're a pretty smart minority. They figure they won't ever get to fly to space in their lifetimes, so might as well deny indisputable fact hoping Elon Musk will give them a free trip to prove them all wrong... Actually, I take that back. That's still monumentally stupid. lol
@@KuK137 You're getting the shape of the earth mixed up with geocentrism. It was known the earth was a globe since the ancient Greeks. It was widely known, even among the lowest classes, through out the ancient world. It's a myth that Columbus's contemporaries thought he'd sail off the edge. The reason they were reluctant to finance his trip is that he had calculated the size of the earth wrong, thinking the distance to Japan was 6000 miles less than they knew it to be. So it's not just that flat earthers are a few hundred years out of date, but a few thousand.
@@painttank68 Dude, people knew the earth was a sphere before NASA even existed. The Greeks and mesoamericans found that out hundreds to thousands of years ago, without contact with each other, and resulted in things such as hyper-accurate eclipse predictions and effective circumnavigation around the world with one of the very first trans-oceanic boats, which all worked under the premise that the earth was a spherical object.
YOU'RE PART OF THE CONSPIRACY!!! You draw just as they told you to. Many of us know that because the Earth is flat the courses are indeed all straight lines, you're just keeping up the charade! . . . . (Just kidding, thank you for beautifully explaining the truth. Double thanks for illustrating the polar routes and methods.)
The lines the ships sail along are straight when viewed from directly above on a sphere. Since map is flat those lines are drawn as curves. That could have been shown easily @ 0:50, with a straight line first drawn between 2 points looking from above and then transformed into a curve when the globe is being rotated.
This is why it is so hard to get qualified to navigate ships!! I did this in my Naval high school back in 1984 and it’s a pain in the ass!! We didn’t have GPS and computer assistance back then 😂😂
I would assume that even today in a naval school you would not learn it with the use of GPS and a computer. At least not in the beginning. First - that’s at least my assumption - you will learn how to do all the math yourself and create a chart or something which angle needs to be steered at which position to go straight on a great circle. Making it easier with GPS and computer assistance is nice and certainly common practice in real life afterwards, but for emergencies you should always be able to navigate the old fashioned way. As far as I know ships today still need to carry a classic sextant to make check their position if GPS or the ship systems fail, so there must be somebody who knows how to use it and plot a course with it manually.
So, it sounds like any "great circle path" is actually a straight-line route along the surface of our great Circle. Then, our favorite map projections distort this path to look curved; and, our navigation schemes (longitude/latitude+ bearing, etc) also distort these paths to seem circular.
Very few probably. Not that there's any need for it. I don't know the stats but I'd wager the percentage of voyages lost to the sea has decreased ever since the electronics came into play.
Hi. I appreciate really your videos. I suggest that you do a video on different types of bow there advantages and there disadvantages :Xbow, axe bow bulbous bow
“We all know the shape of the earth is spherical.” Fighting talk. Sadly, there seems to be plenty of people who fail to comprehend this, though they have yet to develop a sensible map or method of navigation across that map. Some even rely on and use GPS entirely ignorant of the meaning behind the acronym: GLOBAL Positioning System.
Great Circle Routes. Use the correct chart with Mercator Projections. Plot the trip line, then take the latitude and longitudinal coordinates and plot on your navigational charts. Yea Haw lots of fun! Go Navy!
I thought this would be about head and tail winds and ocean currents. Or geopolitical and economic factors like taking a detour to avoid USSR airspace or how sometimes commercial aircraft take detours to avoid airspace with expensive ATC fees.
And then there is the ceilings in the various currents that you have to adjust for so that you end up at your destination and not hundreds of miles off course. Good times in navigation classes
Has nobody picked up yet? He referred to lines of longitude as parallels. Many times! Lines of longitude are called Meridians. Learned that on the first morning of the first day of my navigators course.
Duh, it's to avoid the sea monsters located on those old maps!
Thar be dragons
Forsooth be the loch ness monster
I reckon a kraken
Oh rly?
Those maps are not real obviously, they depict fictional routes 🤦♂️
I have never been on any boat and I don't live near water.
Why do I like this channel?
Former life a sailor?
It's great to have you aboard Adam
I don't know but I've never been on anything larger than ski boat and never on the ocean. I love the crossover with aviation though.
Same here. I'm not into ships but this channel keeps me coming back
Why are you asking questions you'd only have the answer to?
When I flew from Switzerland to the US, I flew a curve (on mercator maps) over Greenland, which I did not realize before the trip. I actually saw the ice masses below me at once, which was an unexpected, exciting sight.
2:31 "On a polar projection, a great circle track is a straight line."
- This is only true if you are traveling on a meridian. In all other cases the path of a great circle on the polar (Equidistant Azimuthal) projection is in fact still a curve. I saw only two other comments mentioning this, but they were buried way down the page, so I thought it worth repeating this small but important point.
Other than that, this was an excellent video. Very clear, and pleasantly narrated :)
An additional interesting fact: A straight line on a Mercator projection is called a rhumb line or a loxodrome. It is the path you will follow if you stay on the same bearing throughout the journey. Keeping rhumb lines straight is what results in the area distortions at the poles on Mercator. If you are navigating without being able to determine longitude precisely, and using only a compass, the Merrcator map is an invaluable tool, hence it's popularity in older times. Now we have accurate clocks and GPS, and other map projections are gaining popularity.
For Great Circles to be straight lines, look at the Gnomonic Projection. Brilliant way of making the earth look distorted as well! 😜
You sound like a geomatic or a surveyor or something, right?
@@fouadkhattar No, I am just an amateur. For fun I have been playing with programming different map projections on my computer, so I have learned a bit about the topic that way. The real professionals know a lot more than I do :)
@@michaeldamolsen ahh i see, great for you man, those stuff aren't easy yk, mathematical formulas are a damn pain in the ass 😂
@@siddarthgrewal Thanks for the excellent addendum!
**slaps roof of comment section**
This bad boi can fit so many memes in it
Your internet jackpot is ready, sir.
The Master Tanker?
I challenge you to a dual in WoTs then.
Do ships take advantage of ocean currents or are they not making any big difference?
They do make a difference. We use charts that show the currents of the world to try and save fuel
Yes, Navigators or Captains do. It's like an added benefit - like when a plane encounters tail wind and it gets to the airport earlier than planned. Same concept.
@Ed Peters Do you have dictionaries on those ships?
@@maxscott3349 these books are called publications. Yes, we have an abundance of them. Nautical Publications.
I've heard a crew of a yacht claiming that they have gained places during a race by anchoring. They noted that they couldn't sail faster then the current they were up against (i.e. effectively going backwards) and dropped anchor. Some of their competition didn't . . .
This also had the side effect of allowing them to rest and be more effective when wind and / or currents shifted in more favourable directions.
In Aviation the "North Atlantic Tracks" for example are calculated daily to take the most advantage of jetstreams, I'd be surprised if something similar didn't exist in the maritime world, as well . . .
this info is all well and good Casual Navigation, but one question you've never been able to answer is, What DO you do with a drunken sailor?!
Ahh.. That's easy.. You need to put him in the longboat until he's sober
if i were the lad, i'd rather you put me in the bed with the captain's daughter
You sure his balance isn’t just off because the ship rocked all day?
Nowadays, we send him home. End of story.
Nothing works like sticking him in the scuppers with a hose pipe on him.
These videos are awesome. They are simplified enough for anyone to understand, but also have enough depth to be interesting to those with a bit more knowledge. I've never had much interest in nautical stuff, but I've been bingeing these all week.
“Because we all know earth is a sphere”
Me, who is a minecraft Villager: Nah it a _ＣＵＢＥ_
Edit: because so many people are taking this seriously I have to point out that THIS WAS SUPPOSED TO BE A JOKE
No! Its a dodecahedron!
no its a cylinder. so basic
Villager Number 78, I was confused by your comment until I saw your avatar. We come from different worlds you and I.
Villager 78 sorry i have to ban you for misinformation. :pban villager78 misinformation
It’s an infinite flatness, humans cannot go beyond the Infinite Ice Wall - the ancient Giant Nephilim and Mole People live there
title: why don't ships go straight?
plot twist: they are actually going straight
Exactly. "Straight" relative to what?
@Miles Dyson
I didn't say they did. What are you talking about?
Also, water does not truelly level due to surface tension. You can easily see this by placing a small drop of water on your finger. It dosn't sit flat or level but is curved. The larger the body of water the less evident it is.
@Miles Dyson It's not an analogy, it's a small scale experiment demonstrating a principle in physics. Surface tension is a thing and it effects the behavior of fluids. It's how certain insects can "walk" on the water's surface without relying on buoyancy of their body, like a ship, but on the surface tension of water
If it helps, take a more viscous fluid like engine oil, especially if cold, pour it into a level contain, wait a bit and comeback and look at it. It dosn't sit perfectly flat in the container.
Fluid does level out but it dosn't sit perfectly flat.
@Miles Dyson exactly miles. The water levels out on the curvature of the earth.
Now please give me your version of how tides work. I'll just go grab some beer and popcorn first.
I have been working and playing on boats for 30 years and enjoy every one of your vids.... Keep up the good work!
Thanks Brendan, it's great to have you here!
For God's sake don't show this to any flat-Earthers.
to late i seen it now
*COUGH COUGH* We cube earth believers are offended XD #Minecraft
@@clivekibbler4578 so what do you say
EARTH FLAT, REEEEEEEEEEEEEEEEEE
@@clivekibbler4578 it's obvious that you're stupid you did not even spell "too" correctly
The oceans/open sea scare me (bad experience when I was young) but also fascinate me, and this channel is the best I’ve found so far. Subscribed!
*Why Ships Don't go Straight:*
1. They're Gay
But we call ships "She".
@@atzuras I'm pretty certain females can be "gay" mind blowing I know.
@@9HighFlyer9 If a 'she' like a man, then isn't it straight?
@@9HighFlyer9 There are no real lesbians, just bi girls and unfuckable fuglies.
@@atzuras We also call drag queens "she".
I love your channel. I learn so much !!!!
You were born to teach. You are really good at it.
Patrick from Bethesda, Maryland, USA !!!!
Thanks Patrick. Glad you enjoy it
I like how UA-cam's algorithm answers the questions I never asked
Because *some one* didn’t fix one of the front wheels
Looking at you
STEPHEN
God damn it
GREG
Short answer: they do, it's your map that's screwey.
It's Earth's fault. Why does it need to be a sphere when it can be just flat? That way our maps don't need to adjust and neither our calculations.
Love the way you say we all know the charts are skewed and the earth is round... then do an entire video that by your logic we all know!
This also applies to aeronautical navigation. funny how similar aircraft and vessels have in common.
It's not that surprising really. Both vessels have to travel over the same distances so the principals of how you make sure you know where your going are more or less the same. The only real difference is the speed at which your are traveling and what happens should you run out of fuel.
That’s not all. The same principle applies to both the wings on an airplane and the rudder. Also, I’m not sure about this one, but I guess airplanes use red lights for PS and green for SB? Can anyone confirm?
@@alexengler486 That is correct. Aircraft use the same red PS/green SB markers as Ships. Also uses nautical miles and Knots in navigation and speed. Basically an airplane is a 3 dimensional boat. The air moves just like water. only less dense.
They are both passing through dynamic fluids.
@@alexengler486 Those lights also apply to spacecrafts
I really enjoy watching your videos, even though I am more a plane than a ship person, just because planes taxi 20 kts on the ramp and ships go 20 kts over the sea ;)
But it is really interesting to see that 90% of the stuff you explain in your videos could be put 1:1 into aviation. Maritime and Aviation are just best friends :)
"We all know the shape of the earth is a sphere"
I think some people need to relearn this part.
I don’t even care for boats, but something about these videos is so interesting and relaxing.
Thank you I am an out of date sailor I haven't sailed a yacht now since 03 and then it was done through the Islands off of Dubrovnik So was in the Med therefore sailing the easy way My Dad taught me to sail in a Mirror dinghy on a manmade pond then the River Thames and finally the English Channel through my own efforts I went on to the East and South sailings (to foreign shores) Sorry I'm rambling You have awoken me to actually get round to doing my official courses ;-))
Dubrovnik is a lovely sailing ground. Hopefully you are able to get back to the courses. Glad to have helped get you back into it
this week i had a test of navigtion about greatcirkels. thanks for the video!
this was more detailed than i bargained for
In the 70s I had to learn navigation to pass a charter license for my dad's boat. They pointed out if you didn't account for the curvature if you left California for Hawaii you'd miss by a couple hundred miles. We just ran coastal so it wasn't a big deal.
You are a bit muddled there. There is no curvature to account for. You go from one to the other along a straight line, ignoring currents and winds for the sake of the argument. You would use a gnomic chart that would show your course as a straight line, and not a Mercator. For short voyages Mercator charts are fine, but a trans ocean, as you suggest needs a gnomic too.
@@geraldlrstubbs No I don't think so, the Mercator was sufficient as it worked to keep us 250 miles off the Nicaraguan coast and outside their jurisdiction. It apparently did not make any difference to them as they attempted to board us and we out-ran their 33 foot open twin outboards in a sea too heavy for their unseaworthy skiff. What a joke, probably pirates. They fired across our bow and really pissed me off, but my dad wouldn't let me return fire.
It'd be great to have a video explaining, with your amazing clarity, how bearings are read and understood. At some point you said: "...bearing of 0-9-0...", this is what I'm refering to. My apologies if you already made one, will have to look it up :-)
Thanks a lot for another great video!
@@kirkhamandy Got it, thanks a lot mate!
Maritime phrases and phonetics would be an interesting topic to cover. I'll note it down for the future.
@@CasualNavigation Awesome, thank you!
We say 090 so three digits are used.
If we just say 90 it is possible that we actually said 190 but 1 was not heard. 100 degrees off course and in big trouble.
@@kirkhamandy In your example the word ninety sounds very similar to nineteen, especially with a noisy background or an unfamiliar accent.
I remember seeing Antarctica and the Arctic in 2 circles on one of those large classroom maps, and I spent a good while trying to locate these 2 locations on the map for a while, before I realised they were supposed to show the North and South poles...
You should do a video showing how trips would actually travel if they had followed the "straight" line course on a globe.
They would go iin a straight line...
On a small vessel wind and current tend to move a vessel off course, so constant corrections are needed to maintain a course that will get you to your destination. This also results in a curve track.
@@siddarthgrewal true
Now I know, I used to have the same question too. That makes sense. Thank you Casual Navigation.
Any possibility you might do a video on creating ocean routes, charting courses manually, and how this was done in the olden days before electronic systems? I'd find the history and math involved in seafaring navigation to be interesting.
“Also compatible with aviation!”
Also walking *V E R Y L O N G* distances
Best short answer to explain great circle routes I’ve seen. Well done
Thank you for this. I always understood the how of the great circle routes. Seeing it depicted graphically helped me comprehend the why.
Why don't ship's go straight?
- because they're ferries.
Nice one
Underrated comment
Can't like your comment because it's sitting on 69. Here's a reply instead.
Good to see you back!
An old Bugs Bunny cartoon exhibiting Bugs Bunny catching a baseball that he threw around the world can validate this video. Good arm.
I just found your channel about 3 mouths ago and I love the content and the videos. Before I found This channel I didn’t know much about ships but know I feel like I could teach others about the topic. Not saying I want to steal your teachings and pass it off as mine but I mean the way you teach about it is simple enough to understand.
Thanks Kathy. It's great to hear the content is raising awareness of the maritime world.
It is the same if we look on a route for a plane. They are curved too at some places when you look on a map
The essential difference is that with planes, they don't care if they are flying over land or water, and can always take the great circle route as long as there are no countries with overfly restrictions in the way. Ships also have to navigate around the choke points created by land.
There are only two parts of the world that are "natural no-fly zones" for planes without a destination there, which are Tibet and Antarctica. Antarctica, because of the lack of contingency airports along the way, and not enough customer-demand for large enough planes to fly the routes that could fly the long hauls that would cross Antarctica. And Tibet/The Himalayas, because the high elevation of the land, gives no margin of error for diving the plane in an emergency descent when it loses cabin pressure.
And that is how we know the earth to be banana shaped.
Yeah I had some friends who flew from England to San Francisco, and their mind they just imagined they were flying west, so they couldn’t understand why the pilots told them they were coming in over the Arctic in northern Canada because it can be really hard to conceptualise navigating on the spherical surface.
Calculations made clear if you use the ocean currents you can save up 20% fuel.
So now a days the line even look more weird.
I'm more confused the more you explain. 😭 I should have stopped watching when I realized the main point was that the Earth was curved. Stupid geometry still haunts me.
The earth is the shape of a can of Pepsi!
Clear now?
How people stand heads up in lower parts of earth, say, Australia? Since childhood I am scratching my head. 😟
Use a piece of string and a globe to see how this works.
@@jackmortimer329 That says it all. How stupid and confusing is this video? A lot.
@@ravishankarprabhu2423 our sense of standing up and down is due to gravity. The fluid in the ear gives you the sense of what is up and down. Gravity is what's pushing the fluid down hence you know you are standing straight. Wherever you go on the earth, the gravity acts normal to the surface
Hey! You don't get to tell ships to go straight, let them love who they love!
Ok jokes aside good video
Thank you . I may not always have seemed supportive but i love all of your videos. Thanks for sharing your knowledge.
Thanks yax. Glad you enjoy the content
I never dissapointed with all the channels i subscribed. Including this one. Good job mate
The earth is actually a Rhombicosidodecahedron, not a sphere
i agree
Flat!!!!!
Yes, i too, am a rhombicdobfifsjxynz4bzclgaedron
No
Sus
You just couldn't give a straight answer.
He's as bent as a nautical route.
Like my old navigation teacher used to say: “The earth is not flat as a pancake, the earth is round as a pancake”
You never fail to make any subject interesting :) Thank you
Nice video Sir, really nice. We need to educate our children more in geography, navigation, and basic mathematic principles and you are doing your part.
If I can expand to define a ‘great circle’ (aka orthodrome) in lay terms it’s very easy to understand without going into complex mathematical proofs.
A great circle is really just any circumference line on a sphere. Think of it as taking the equator line and moving it to different positions on the globe. Just line up that line to connect any two points and essentially you have a ‘great circle’ drawn.
What’s truly astounding is this geographical, mathematical, cartographical, and navigational principles and knowledge was developed by men using eye, ink, quill, and abacus. From ignorance and darkness, they brought light to what was previously unknown. True genius! We truly see further because we sit upon the shoulders of these giants. To think these men are now disparaged as ‘racist’ or ‘patriarchal misogynists’ or whatever...
Sorry, it seems I went political but this type of classical education is forgone to instead indoctrinate children in identity politics and other anti classical liberal pursuits. It’s sad, we are denying children their innate sentience and capacity for reason, and their western civilization intellectual birthright to instead advance partisan causes which will only serve to further eradicate true education from our children.
White westerners have no monopoly on genius. Nor do all of the ideas which shape the modern world originate in the west. Nor do all of the basic tools which are required to make everything work. I am quite certain that neither the decimal numbering system nor the alphabet now used in places like the US or the UK originated in the west. Nor did the concept of zero. The Pythagorean theorem has been found on clay tablets out of ancient Mesopotamia at least 1500 years before the age of the Greek city states. "Identity politics" was okay when white explorers, adventurers and settlers designed and imposed a racial hierarchy on the parts of the globe which they managed to conquer and/or colonize. But now, when that paradigm is challenged, it's a problem? For whom? Let's not pretend that "once upon a time" a pure, non ideological, and merit based "education" system existed in the US or anyplace else for that matter. Indoctrination has always been omnipresent in many forms ranging from the way the histories and contributions of many societies are disappeared and the way massive wrongs and injustices both past and ongoing are either white washed, justified, or not studied at all, unless those in power can score points or claim some sort of moral authority by doing so.
I clicked because of that T E N E T ship in thumbnail :-) Did you too?
I feel like this managed to make a pretty straightforward answer ("because the Earth is round") quite a bit _less_ clear.
2:30 on a polar projection you also get distortions. the straight line plots the shortest route only if it goes over the north pole. for a boundary condition, take a polar projection and draw a straight line between two points on the equator. that will obviously not be shortest route. in order to be able to draw a straight line as the shortest route, you would need a polar projection with a centre of the projection not at the north pole, but actually on the shortest route. similarly, if you have a custom mercador projection with a 'projection equator' (i.e. the circle on the surface of the sphere that does not get stretched in the projection) not on the earth's equator, but rather passing through the route start and finish, then the route will be as straight line.
Because the Earth's an oblate spheroid?
@Jon Goat Not really. Nobody of importance thinks the Earth is flat. The falt Earthers are a vocal minority. An extraordinarily loud, extraordinarily stupid minority.
@@magisterrleth3129 I wish I could give you more likes! A lot more!
@@magisterrleth3129
No, they're a pretty smart minority. They figure they won't ever get to fly to space in their lifetimes, so might as well deny indisputable fact hoping Elon Musk will give them a free trip to prove them all wrong...
Actually, I take that back. That's still monumentally stupid. lol
Slightly fatter at the equator than an actual sphere would be.
Nope. Gotta come back to this when I'm not so stoned..
Thank you for explaining this. It's very interesting!
Ok? You got it now? Curved is short and straight is long. My head hurts. 🤯
No no no you can't say that the earth is spherical in 2019, people are going to get offended and get their feelings hurt.
Only conservative retards and alt-righters still living in medieval times when round earth was a heresy...
@@KuK137 You're getting the shape of the earth mixed up with geocentrism. It was known the earth was a globe since the ancient Greeks. It was widely known, even among the lowest classes, through out the ancient world. It's a myth that Columbus's contemporaries thought he'd sail off the edge. The reason they were reluctant to finance his trip is that he had calculated the size of the earth wrong, thinking the distance to Japan was 6000 miles less than they knew it to be. So it's not just that flat earthers are a few hundred years out of date, but a few thousand.
Flat earthers: Im gonna pretent I didn't see that.
I know the answer to this video. I learned this in social studies lol. Still love to watch your vids.
For, safe, economical and efficient. Very good video. thank you
"We all know the world is spherical" ahhhhhh idk about that. Theirs a group of lunatics that are convinced the world is flat
@@painttank68 Dude, people knew the earth was a sphere before NASA even existed.
The Greeks and mesoamericans found that out hundreds to thousands of years ago, without contact with each other, and resulted in things such as hyper-accurate eclipse predictions and effective circumnavigation around the world with one of the very first trans-oceanic boats, which all worked under the premise that the earth was a spherical object.
@@painttank68 You might want to read it again - it describes a theoretical model, not actual findings about the real world.
YOU'RE PART OF THE CONSPIRACY!!! You draw just as they told you to. Many of us know that because the Earth is flat the courses are indeed all straight lines, you're just keeping up the charade!
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(Just kidding, thank you for beautifully explaining the truth. Double thanks for illustrating the polar routes and methods.)
This knowledge works perfectly for ATPL pilot course aswell
Thank you for not using the Greenland-africa example for the Mercator
Obviously they go in curved lines because they want us to believe that the earth is spherical, duh!
How can you go straight when you're always full of seamen?
I laughed. Im stupid.
Such an amazing speaker. Very similar to Judge Rinder.
The lines the ships sail along are straight when viewed from directly above on a sphere.
Since map is flat those lines are drawn as curves.
That could have been shown easily @ 0:50, with a straight line first drawn between 2 points looking from above and then transformed into a curve when the globe is being rotated.
Nonsense. We all know the Earth is squash-shaped
8 Seconds Ago!!!!!!!!!!!!!!!!!
Fastest click in the west
So, are you saying, the earth is NOT flat?? This is little more information than I was ready for. I think I need a nap.
i have done great circle sailind from 60 degrees north canadian port to hakaido japan. we even entered allusion islands.
Wait a second this is all wrong everyone knows the Earth is flat
This turns out to be a potential strategy of defeating the flat earth theory once and for all.
This is why it is so hard to get qualified to navigate ships!! I did this in my Naval high school back in 1984 and it’s a pain in the ass!! We didn’t have GPS and computer assistance back then 😂😂
I would assume that even today in a naval school you would not learn it with the use of GPS and a computer. At least not in the beginning. First - that’s at least my assumption - you will learn how to do all the math yourself and create a chart or something which angle needs to be steered at which position to go straight on a great circle.
Making it easier with GPS and computer assistance is nice and certainly common practice in real life afterwards, but for emergencies you should always be able to navigate the old fashioned way. As far as I know ships today still need to carry a classic sextant to make check their position if GPS or the ship systems fail, so there must be somebody who knows how to use it and plot a course with it manually.
So, it sounds like any "great circle path" is actually a straight-line route along the surface of our great Circle. Then, our favorite map projections distort this path to look curved; and, our navigation schemes (longitude/latitude+ bearing, etc) also distort these paths to seem circular.
Literally any map projection distorts it, because it's impossible to accurately display a 3d sphere on a 2d plane without distorting it
This is a great explanation, it seems so simple now thank you for the video. I believe the same explanation should apply for airplane routes.
Awesome presentation. Electronic age has foregone theory. I wonder how many sailors today can navigate without electronics.
Very few probably. Not that there's any need for it. I don't know the stats but I'd wager the percentage of voyages lost to the sea has decreased ever since the electronics came into play.
@@SoulmongerV2 they still plot their course on paper map alongside electronic navigation. Watch JeffHK's channel as he talks about this.
"we all know the earth is spherical"
Bold statement, ngl
Hi. I appreciate really your videos. I suggest that you do a video on different types of bow there advantages and there disadvantages :Xbow, axe bow bulbous bow
Thanks oussama. I am hoping to cover different bow designs some time.
“We all know the shape of the earth is spherical.” Fighting talk. Sadly, there seems to be plenty of people who fail to comprehend this, though they have yet to develop a sensible map or method of navigation across that map. Some even rely on and use GPS entirely ignorant of the meaning behind the acronym: GLOBAL Positioning System.
Not to mention navigational paths are plotted to either take advantage of or avoid specific ocean currents
Great Circle Routes. Use the correct chart with Mercator Projections. Plot the trip line, then take the latitude and longitudinal coordinates and plot on your navigational charts. Yea Haw lots of fun! Go Navy!
I already know that, but I still wanna set sail someday. Great video.😁
This explains so much! Thank you!!!
This is really helpful! Thank you for explaining this to me! Great video as always!
I thought this would be about head and tail winds and ocean currents.
Or geopolitical and economic factors like taking a detour to avoid USSR airspace or how sometimes commercial aircraft take detours to avoid airspace with expensive ATC fees.
And then there is the ceilings in the various currents that you have to adjust for so that you end up at your destination and not hundreds of miles off course. Good times in navigation classes
1:50 [talks about the distortions of mercator projection] [shows a robinson projection map]
Typical map projection casuals 🙄
I believe in olden days, when a boat sailed the straight line, sailors called it 'going over the hump'.
Sorry the earth is actually a dirty brick chimney , not an oblong spheroid.
Really cool to see why there are always curves on massive navigation maps.
Thanks. That was a great explanations.
Excellent information, THANKS for sharing!
Your back!!!!!!!!!!!
Has nobody picked up yet? He referred to lines of longitude as parallels. Many times! Lines of longitude are called Meridians. Learned that on the first morning of the first day of my navigators course.
GPS is one of my favorite technologies