Sjizzle, can you please explain how do you do measurements when measured object is higher than 20-25 deg? How do you eliminate possible errors due to boat instability since we don't have classic sextant double prism view implemented in the game?

there is an in realism settings an option which one make the both to be stable... i can recall the option name

I see, you mean "no scope movement" or something like that. :yep: But do you have any trick for precise measurements with 100% realism? I noticed that if you dive to 8 meters your boat will be perfectly stabilized and the sextant can still be used...:yep:

yea if u dive 7-8 u can use the sextan and the both is stable ....i always used local noon to find out the my latitude...and used this Sunsight.xls file to find out my longitude then Ded Recognin till next day local noon...using the stars to find out your location u need know very well the celestial body's and the SH5 map it's damn unfriendly for that kind of navigation...i never used time compression more then 128 because u will drift really far away from your course...us DR each 2-3 hours....
i also use Stellarium parallel with the game...there was some .bat file somewhere and u could connect stellarium with SH5 made your navigation really easy...

Thanks Sjizzle for your help.

I must praise my self a bit. :) I think I have learned how to take local noon latitude readings and and also to find Polaris!

Local noon latitude is actually quite simple. The biggest problem here is to determent when "local noon" exactly is (when the sun is actually on zenith).



Also, it seems that in order to take the most accurate measurement with built in sextant one has to :
- Dive to 8m to stabilize the boat
- Align the sextant with the horizon and nullify it using stadimeter button
- Then, taking measurement by moving sextant up (not by using stadimeter button because it seems that it will introduce some error) until it's aligned with a celestial object.


Using this method I think I achieved the best results...

Thank you gentlemen! As soon as I have some time I’m definitely going to go back into the game and try this out. Regarding the other stars, I have a pretty good method of identifying stars by doing the sight reduction in reverse, so I’ll test it out with some star sights too.:up:

Hm, it seems that my sextant measurements are always "short" for about 30-50 minutes, even with "no stabilized view" option disabled. Not sure is it due to sextant or my measurement precision... :hmmm:Any comment Sjizzle? Maybe I should aim for top of the sun instead of center?

never center or top of the sun... always bottom of the sun...local is noon when 12 PM local time not UTC !


Edit:

forgot to say if some mod change the cameras.cam files from NewUIs_TDC_7_5_0_ByTheDarkWraith\data\Library\ then u can forgot the sextant...all measurements will be way off

Hm, if aim for the bottom of the sun I'm of for a entire degree :hmmm:.


How do you mean if we change cameras.cam file sextant won't work properly? We all use different cameras.cam settings (remember resolution patches). I tried with different cameras.cam files, even the one from default TDW New UIs mod but still , results are pretty much the same. Can you upload cameras.cam which you use for sextant?


One more question. When should I take sun readings? When the sun is highest on the sky (this is local noon if I understand this correctly) or at 12PM local (nautical) time? Local time is actually nautical, right?

the default cameras.cam from tdw's i think is for 8:5 ration and that one work perfectly and i think not sure but tdw edited all cam rezolution...if nope then i must look where i have my all resolution patches and i'll send it to u... Manos 100% sure nut sure about large optics....

local noon when the sun is the highest on the sky...yea local nautical time...

From my testing, resolution patches (or angular angle settings in cameras.cam file) are completely irrelevant for sextant. If I measure altitude by moving uzo/sextant up, the results are always the same and that is what is confusing me. :hmmm: I even if I set some abnormal values for UZO angular angle in cameras.cam file, I still get the same results. For now I can only conclude that either I'm doing something wrong or sun position in the sky is approximately 1deg "lower" that in should be. :hmmm:


Large optics mod is just different (bigger scope circle) dds texture for scopes. It has it's own set of resolution patches but like I sad, It appears that these aren't effecting sextant measurements. For example, manos scopes resolution patches should work just fine with large optics and sextant.







And It's almost never at 12.00 PM exacty, right? That guy from YT sad that local noon when measurement should be done is when the sun is due north or south of you. this means 180 or 0 deg of true azimuth from our position? Did I understood this correctly? :hmmm:



Sorry for annoyances Sjizzle but this celestial stuff really starts to fascinates me...:D Cheers! :salute:

The sun at its highest point (LAN or local apparent noon) will be on your meridian i.e. directly north or south, that’s correct.

I really hope this gets sorted out - watching with bated breath here!

OK Captains, I think I got it...


I noticed that if I aim for top of the sun if the sun is south of me and/or aim for bottom of the sun if the sun is north of me(talking about local noon when sun is on my meridian), my calculations will be very accurate withing 5-10km of my real latitude, which is quite good IMO. :yep:


Now, I'm not sure is this due to some kind of sextant error or due to slight sun deviation in SH world but I'm pretty much sure that it isn't due to my measurements.


Tested this on various locations and different dates all around northern hemisphere and the results are pretty consistent. :yep:

Still WIP though...


https://i.postimg.cc/P5ZvthV2/Capture.jpg

Just a related question. I keep getting radio messages about events taking place at certain coordinates. But how do I find coordinates on nav map? Like they say some German ships got attacked at 50’ west 29’ north. How do I find that coordinates on map so that I can probably lend a hand.

Explore the available charts and you'll find what you're looking for, maps and map tools and speed conversion sections...