This is so thrilling. I haven't been this excited by an SH3 project since the first Open Hatch mod thread surfaced.
I was always interested in real navigation but the limitations really kept me from wanting to go all in with it. This has now really piqued my interest.
I gotta commend you on making some of the most exciting mod work in a long time, and completing your second stage in time for my birthday no less!
I will be watching this closely as you move forward.
EDIT. Btw I found randomly in a download in the SH3 section on this site amongst some of Carnovaro's misc files a sun and moon chart for the lat and long of London for the duration of the war. I don't know if its just taken from the actual almanac or if its actually observed from the game. Not sure if that would help you at all. The moon stuff is only for the different phases of the moon but the sun chart is for rise and set.
http://www.subsim.com/radioroom/down...o=file&id=1487