There’s always this:
https://www.subsim.com/radioroom/sho...d.php?t=134816
Mod your game to hide your own boat icon, then…
By way of a python script that pulls your coordinates out of SH3 or SH4, and puts them into a planetarium software, you can go into the software and get your real world sights, go back into the game and plot it. I’ve done this quite a bit. The only caveat is that the game then becomes all about this, and you tend to get burnt out pretty quickly. But it scratches the itch.