There is a utility to use pyhton software to read your save games either directly or via network (to not interrupt your patrol). It converts SH sub position and when you load Stellarium the date and sub's location will be already loaded. Just take your "sextant" readings there then it is up to you to use Cel nav software that accepts 1930-40's range or do it yourself. I am still trying to find but it is here in Subsim. Of course there is also a utility to replace your sub's with a transparent one as to not reveal your true location on the map. Some SH you can "cheat" by pressing spacebar so the map will centered on the sub.
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