Real Navigation Mod

I've encountered a serious problem. I'll try to contact Val but probably he's stuck at the same point.

I've finally figured it out how to obtain long having lat and sunset time. First of all I've made lat measure at noon and it has 20 minutes accuracy which gives 37km error (measured 53°30N, real 55°50N). Quite good for a total rookie.

3 hrs earlier I've noticed sunset time and here's the big problem. It doesn't fit anyhow using Vans almanac. The reading should be 15 minutes before sunset in Greenwich to give my current position which is about 3°50E (-15/4=3°40E). Sunset reading was way out of scale giving +59' difference so we should be 15°W!!

Till now I've observed that from the prime meridian to my current position SH3 shows 468km but Google Earth shows 250 km what gives exactly my 3°50E (1°E/W at 55°N is 62.8km - there is a simple formula for that...). Also the long and lats are equal distance on SH3 map while there should be a disproportion of 1°E/W * ~1.77 = 1° lat in kilometers (at this 55N point). Also 468/250 and you get nearly 1.77.

With above conclusion I went straight W and than N each time @ 10kt for 6 hrs to make 111.12km=1°N. I've made 114km with the sea dead flat so the error is very acceptable depending on varying speed probably. But the problem is that I've made 1°W and 1°N as looking at the map while I should really make 1°46W...

I suppose it ruins the longitude thing and can't be fixed while the whole gameplay coordinates would mess up...

Any ideas? HELP!?

Either way I'm gonna buy KM Sextant some time and hit the Baltic Sea with my also considered as not completely normal friend. I wonder where we finish without looking at GPS