I show sunrise and sunset times as being off, I seem to recall this was an issue with SHIII, is that the case with 5?
https://www.esrl.noaa.gov/gmd/grad/solcalc/sunrise.html
^this shows sunrise for 56°47'N 1°3'E on 08/11/1939 as 'apparent' 0719, whereas the board in-game has 0705 (118).
Will this interfere with Cel-Nav?
Currently have bad weather, so pitching/rolling deck is messing with my results.