The earth wasn't flat for SH2
SH2, with a very simple navigation map/chart and very bad tools, used a spherical earth.
It also had an implement lost on SH3 and SH4: when you come to a point out of your ship, you could get distance and cap to go there.
I realised that earth was spherical running a single mission in the American coast: the cap and the distance to return to Brest was the orthodromic solution, and in the way back, you had to correct the cap every 6 or 8 hours to reach yout base.
When I switched to SH3 I couldn,t believe this step back (many other things were far better), and I keep missing this capability with SH4
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