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Yes is automatically syncs time every 24 hours. You can manually sync between automatic updates if required. I'm not sure it will work in Indonesia. The nearest transmitters are in Fukushima and Fukuoka Japan and the watch manual gives them a range of 1000km so indonesia is a stretch. I'd be interested to know if it works.

For navigation certainly. Mine has repeatedly been doused with sea and rain water and has never faltered. It is a utilitarian design. It's very well made with large easy buttons and a functional, easily read display and light. I'm not a watch type but those who are would probably not describe as beautiful though.

Is the watch industry Japanese or Chinese?

@@ناصرالسنهوقاهرالمرتدينوالم-و9ذ Mine was made in China.

@@patrickmitchell9829 Thank you my love

You could look at 2 glass beam splitters rather than Yrvind's original 3 glass. These do not work with plane glass because of attenuation but they do with beam splitters. I have not experimented with them but would be interested.

Yes for sure. They are more accurate than long wave time signals and have global coverage. Only thing is that if you have working GPS will you be using a sextant?

I've been meaning to make a video specifically about the use of welding glass but haven't got round to it yet. I briefly mention it at the end of my video on Bris sextants theory and there is a picture of my arrangement using welding glass as an additional filter at timestamp 9:10 in that video. Yrvind did what you suggest and cut a piece of welding glass to size to act as one of the three glasses in the sextant, the outer one. You could also use it as the inner one but you can't use it as the middle one without altering the relative intensities of the different reflections. The problem with that is that it makes it very hard or impossible to see the horizon through the sextant and it also means you can see fewer reflections because the lower ones become too dim. So I mount it as a fourth glass on the observer's side of the sextant and only covering the top part so that it only filters out the real image of the sun and the first three virtual images. I use a much wider welding glass than the sextant is so that it filters the sun for both eyes; the sextant's only being viewed through one eye. This makes the sextant significantly larger than Yrvind's original but it gives you more reflections, and it also allows you to see the horizon more easily through the sextant.

Thank you for this reply! I do hope you'll have time to make that other video: this and the theory video are both excellent

I don't see why it shouldn't work, but it might be difficult to assemble. It's much harder to get two joints to set correctly simultaneously than it is to get just one. And if you use a wedge, you'd have to get the wedge in position and the second glass at the same time if you glued both joints together. If you didn't and started by gluing the wedge onto the bottom of one glass and then gluing another glass onto the wedge, it would be really hard to keep the second side of the wedge free from epoxy. If any epoxy got onto it, it would alter the angle. I found even for microscope slides with two glued together at one end, often epoxy gets on the outside of one or other of the slides to interfere with a subsequent joint. I imagine it would work well for a sophisticated manufacturing processes, but for making it by hand would probably be difficult.

It is an esoteric interest now, but it is not imprecise. With a human making measurements it cannot be as exact as GPS but that is because of human imprecision, not intrinsic weakness in the system which can be more exact than GPS using large land based telescopes and automated measurement.

I have a look at HF time reception, what little I know if it suggests it is not always available and depends on weather day/night etc and requires a dedicated aerial and receiver.

Thanks for the comment.

That sound like a better method. I'll try it. The waveceptor is a radio controlled watch. Can you turn the radio off? If not it would be tricky to rate as on shore it will always keep time and only drift when out of range but you need the rating for when it is not in radio contact. Also you'd have to know when signal was lost so when to start applying the rating. Noting the time at dawn or dusk is awkward. I am long sighted so cannot see the seconds with the sextant at my eye. I have to move it about 50cm away so a watch that lets you sync the chrono with the time would be great.

@@patrickmitchell9829 Hello Patrick, yes you can disable radio sinc. for rating. And the clock lets you know the exact time and date when it last sincd. You have the clock visible in the stopwatch mode so you can start it at exactly 00 seconds and start taking splits from there on. Numbers are tiny tho… this watch is great. I also have a rated by me seiko sports chrono, but the splits method on that one is trickier . I rather use casio 10 out of 10 as its always on “almost atomic precision” hehe For your ref mine is WV-59DE-1AVEF

@@tasheido That sounds ideal. I wonder if it was designed with navigation in mind? I get one and rate it. Thanks for the suggestion.

@@patrickmitchell9829 I don't think so, buit it lends itself quite well for that purpose. You can also mange time zones very well with it. If you do get one and rate it let me know how it performs as i never rated mine. Just for my own curiosity!

@@tasheido I have one on order and will let you know how I get on. It sounds promising for the visually challenged like me whatever the rating. Thanks again.

That is impressive, particularly the accuracy of the DW5600! The W800H looks good particularly as it has larger digits. I wear glasses but look through the sextant without them, making it difficult to read the small digits on the W86 and f91w.

lol. if you happen to be good with numbers you can appear to be a lot smarter than you are by simply being bad with words.

Good idea. That is a stop watch so you could press the button without having to look away from the sextant. These two wrist watches also have stop watches on them so you could probably do the same thing but I have not tried it.

Radio controlled clocks and watches use terrestrial long wave time signals. I have little experience of using them but a radio controlled watch I have does not pick up the uk signal in France more than about 100km from the UK coast. Europe uses their own time signals you can set watchs to. They are LW transmission so with a big areal and the right receiver you can probably pick them up most places including the ocean but that is not practical on a boat and ships rely on Sat Nav time. If sat nav is down you may not get the time but it only require 1 satellite so at least in principle you could get sat nav time when you cannot get a position. A rated watch is a lot simpler though.

Solution can be buying the watch with GPS. It is not showing the position, but it is using the signal from GPS to set the time. It has worldwide range and their accuracy don't have to be checked in different conditions.

@@ArekP2 I have seen wrist worn GPS receivers but did not know you could get a watch like that. Is there a model you have in mind?

Thanks for the comment. It is a bit dense! I will try to make an accompanying pdf.

hah, me too

I have the script and but have not written an article specifically. I'll have a look at posting a pdf.

I have now made a pdf. It is here: pdfhost.io/v/ZwXWGtJ3l_Bris_theory

@@patrickmitchell9829 wow, thanks! It was a bit hard to follow it all verbally.

Very interesting…if mind boggling Looking at your last diagram, if the glass plate facing the sun was slightly shorter, would that help?

Glad it was helpful!

I'll include those details. Welding glass shades 10-12 works fine and plane microscope slides cost under $10 for a box of 50. You also need a diamond glass cutter, $2-$3 from Aliexpress.