haha thats hiularious do i give away so much info on the net
well the second gauge is a sextant in which instead of artificial horizont you have a line connected to a clock that wouls show sun altitude in the equator(once adjusted longitude with the other device)
so you take the sextant take the sun to the line look and you have latitude with minutes exactlitud
now if the war had really been that important whay they didnt make these things?