Ok, here are the calculations. I'm horrible at math, so this might be a bad idea
I did leave the boat going 10 knots while I did the calculations before I asked the navigator to get a fix to confirm, which also took some time, but I thought I accounted for that leg of the journey. I don't have the exact position of the boat displayed, and I'm not sure how accurate the navigator is. Perhaps the actual error was 2-3 arc minutes.
So is this correct? If it is, then my question is about what happens if I had say 4 hr 3 min GMT instead of 5 hr 3 min GMT. I think I would instead start with the GHA table value at 0 GMT, but then how do I account for the extra 3 hours?
1939 Oct. 2; PoD = Kiel; Longitude = 0°
Altitude of Polaris: 56°7.3' at 5 hr 3 min 0 sec GMT
LHA = GHA + SHA + Longitude
= GHA + 322°10.7' + 0°
= GHA - 37°49.3
Time = GMT - 1 = 4 hr 3 min
GHA = 69°58.7' (4 GMT table) + 45.1' (3 min table)
= 70°43.8'
LHA = 70°43.8' - 37°49.3'
= 32°54.5'
Arc minutes altitude correction:
37.3 - (0.4x(54.5/60)) = 36.9
LAT = 56°7.3' - 36.9' = 55°30.4'
Thanks!