Arlo, I wouldn't mind the ability to do celestial navigation if it were possible in-game. What's being done now is that people have turned off their position indicator in the nav map. Then they feed the game position to a separate planetarium program. Apparently they even have an in-planetarium sextant so you can actually simulate taking a sight. Then, after doing the calculations to obtain longitude and latitude for your sub, you go back into SH4 to plot the position.
Unfortunately, you also give up the ability to track target positions relative to your boat because there is no indicator for your boat's position. You just end up giving away three times more authenticity than you gain.
If you're not playing the game as such and just want to learn celestial navigation it's a great practice tool.
But in-game our sky isn't good enough to navigate from. I've demonstrated that moon phases and positions are totally wackazoid. You see, I have some of those whiz bang planetarium programs, Maurice Chevalley's Sky Charts (highly recommended and free!) and The Sky for Windows by Software Bisque.
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