Well Ichso I have read on this forum that
Georg_Unterberg can calculate its position within a 10 km radius, when triangulating 3 different stars, using a free little tool called nautictools from
www.nautictools.de.
Find it here
http://www.subsim.com/radioroom/showthread.php?t=114812
The triangulation method is only possible in SH3 if the star to shoot is exactly on the East/West/North (read the files in the realnavadditions.7z for details). With 52 stars to choose from I guess you have quite a choice on which ones to pick.
Download Kunsa's little addon tools and read the readmes carefully. It's quite complex, at least for a newbie like me.
Download here:
http://hosted.filefront.com/Kunsa/RealNavAdditions.7z
You can find his post here
http://www.subsim.com/radioroom/show...ighlight=Kunsa
With his tools you can shoot the sun during daytime, using the Obs scope, He also has a different scale to use on the scope that goes beyond the 1024*768 normal 60° vertical view.
I have made an excel sheet, not quite as fancy has Kunsa's tools to calculate Longitude by using GMT time, Local Time, and Calendar time from Vanjast's Calendar.
Dont forget that Vanjast's calendar is for 1942. He has taken these values as a basis to make the calendar values for 1939 till 1945 because they were a good average and wanted to keep the calendar small (12 pages for Northern and 12 pages for southern latitudes). To be able to do precise readings however you should have a calendar for every day of the waryears.
That could be accomplished with sh3 commander with or without JSGME loading the correct files for the correct year at the start of a patrol so your navmap is not cluttered with calendar sheets.Now, If we use this formula by Hadrys : longitude (in km, per 1°) = (111.320 + 0.373sinēφ)cosφ where φ is latitude
and we can triangulate 3 stars, we should get an position fix, even if we can't use the sunset/sunrise times in SH3 properly.
No, I think this is doable, with my childish method, I can track my position (with sunrise times alone and Vanjast's draggable sextant) to 60 Km accuracy.
We are so close to make this happen. Why not give it a try.