To make it work you have to cheat somehow, because there are no in-game tools to make it happen. The sky is wrong. Your clock is wrong. You don't have a sextant. In order to make an external program work you have to feed your position into the astronomy program to get the position with the "sextant" which is just chasing your own tail. Not only that, but the earth in SH4 is a cylinder, not a sphere or oblate spheroid. How are you going to get real celestial navigation stuff to fix your position on a cylindrical world? It can't.
SH4 is not a planetarium or a celestial navigation simulator. Any attempt to make it one kills the functionality of the game.
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