How To Calculate Compass Error by Azimuth of a Star
Вставка
- Опубліковано 23 сер 2024
- How To Calculate Compass Error by Azimuth of a Star! A short video where I explain how to calculate a ships Gyro or Magnetic compass error from a bearing of a Star in this case Arcturus, by calculating the direction (or azimuth) of the Star.
Ask any questions in the comments - I’ll do my best to answer them.
DOWNLOAD!
Pro Forma: www.alistairbai...
NOTE: This video makes use of selected pages from the British Admiralty Nautical Almanac (Admiralty Publication NP314). The example uses the 2016 version of the publication so if you’re doing the calculation for a different year the numbers won’t be the same.
YOU MIGHT ALSO LIKE!
- Calculating Time of Sunrise - • How To Calculate Sunri...
- Calculate Compass Error by Azimuth of the Sun - • How To Calculate Compa...
ME!
You can read about my training as a Merchant Navy Officer and follow along with my adventures working on cruise ships on my blog (link below)
If you'd like to support my channel you can always buy me a "coffee" through ko-fi.com/alis...
GET IN TOUCH!
Twitter: / alistairuk
Blog: www.alistairbai...
Instagram: / alistairuk
Flickr: www.flickr.com...
Opening Tune: Good Starts by Jingle Punks
This video including its audio and any related resources are protected by copyright - to discuss usage or redistribution rights please contact me through youtube or my website.
#merchantNavy #navigationTraining
If you're getting the wrong answer when entering the formula into your calculator I've created a short video here which explains what you are probably doing wrong and how to fix it: ua-cam.com/video/0YnFY4NGaR8/v-deo.html
Dude, you have no idea how much you have helped me !! Thank you
Explicit explanation.Thanks for your efford.
Glad it was helpful!
Do we have to use azimuth mirror to find the bearing of the star from bridge wings?
Great video ..Sir can you pls show when calculating by Star haw to use admiralty sight reduction tables NP303?
Dear Alistair, could you please to show us formula for Az in right view. I mean how this formula exactly viewing according to mathematics rules. And is it possible to show us one example with digits for finding Az.
Many thks in advnce.
Hi there, the formula with worked example is included in the earlier video in the series using the sun - ua-cam.com/video/lq05HWO51Zw/v-deo.html
can i use ABC table or the ABC by calculator with these aside from that formula given above?
You can use ABC if you wish, the formula I use is based on the ABC formula but combined into a single step.
Does it make a difference if the Declination is south? would you consider that a negative number? and same for E?
thanks
Harry
P.S great video by the way!
@Harry Bould - Sorry for taking so long to reply - hopefully you've worked it out by now, but if not; Yes, if Declination is south you treat it as a negative value in the azimuth formula. If you're referring to the longitude being East, then yes, you would subtract it as the event is occurring before it would occur at Greenwich which is what everything in the Almanac is referenced too. Thanks for watching!
Where did get the gyro bearing of the star? It should be thru the gyro repeater right? Pls tell us how?
Yes, you would normally obtain your bearing through a gyro repeater on the bridge wings.
Hello. How can i get the bearing of a star?
can we use star finder for azimuth
Ashutosh bisht no as the Star Finder only gives an approximation of the bearing of the star or planet, using it to work out a compass error would introduce a potentially huge error.
I don’t understand the Variation and Deviation part, there’s no nautical chart
Why is it N 74.99 E shouldn't it be S 74.99 W since 74.99 is a positive azimuth and is between 000-180? Just asking sir, I'm a bit confused.
NedPH Hi, the N 74.99 E comes from the LHA (Local Hour Angle: 275 deg...) being between 180-360 and the result of the Az formula being positive.
Alistair Baillie Oh I see, thanks a lot mister.
HOW TO LABEL YOUR DEVIATION CLEARLY I STILL GET A BIT CONFUSE
I calculate Az = 15.32. What's wrong?
Depends what you're keying into the calculator, I've tried missing brackets and -ve signs but can't replicate that answer - it is possible you are missing one of the brackets - if you have a look at the Azimuth of the Sun video it explains the formula in a bit more detail.
and my big question is how to get the bearing of the star
What do you mean? Your calculating the bearing of the star using the method explained in the video? If your asking how you know what star you’re looking at - I explain the star finder in another video.