[Pisces]

Originally Posted by Luno

Isn't the SH3 world flat anyway? I don't understand why it should be computationally difficult to pinpoint the sub on a flat surface no matter what projection it was based from.

Yes, that wasn't a very well thought through argument. I was just trying to emphasize that the developers liked to keep it simple. Never mind beyond that.

Originally Posted by Captain Nemo

Pisces thanks for your input which I found most interesting. If I understand you correctly, are you saying that the difference between Google Earth and the SH3 map is only 0.01%?

Forgive me if I have completely misunderstood what you were saying.

Nemo

I can't vouch that percentage for all other places on the map. But in that particular part the Google Earth latitude is 66.56626389 degrees, while the ruler in the game measured it to 66.573333 'degrees'. The difference being 0.00707 degrees, which comes down to 0.01% of 66.56626yadayada. The SH3 map is a bit blocky, so it won't be exactly like the Google Earth satellite and aerial-photography images. The position error would probably be larger nearer the equator, but that is because latitudes are smaller numbers, while the blocks are of fixed size. But I wouldn't worry about it.

When sailing near land you shouldn't be browsing Google Earth anyway.

Originally Posted by Luno

Only in the vertical. However, it is stretched horizontally at higher latitudes.

No, the same holds for horizontal distances in the SH3 map to the Greenwich Meridian. Don't confuse what I wrote with actual kilometers or nautical miles in the real world. Real World degrees are 120 SH3-kilometers tall and wide!!! So on average it would hold horizontally also.

At least superficially, it looks like an "Equirectangular" projection so that lines of latitude and longitude are equally spaced.

"Equirectangular" (wiki)sounds about right.