very nice idea Sublynx !
coast navigation is a really superb addition to game and very enjoyable doing it
i am really fun of any real navigation ,but once i had discovered some time ago -with the help of Don1reed that celestial navigation is NOT working in sh3 ( here are my findings on the theme:
http://www.subsim.com/radioroom/show...1&postcount=57 ) , i find your idea really really superb!
how, will it look ? the user will be able to see the spots in real time in the ingame map (at every zoom level) or will it be something else ?