[ gpsdrive ] Map size limitation and map scale calculation

[Paweł Bednarski]

Let me say first that I'm totally green in terms of geodesy and
cartography but I would like to use gpsdrive with self-made (in terms
of gluing and calculating parameters) maps. So some questions arise.

1) Why there is a hardcoded 1280x1024 limitation for map size?
Or there isn't? Could I for example put map in 2000x2000 size? (my
tiles are 200x200 in size so easiest way to create map from them
is glueing them together and there comes gpsdrive limitation I've
read in man pages about)

2) What is definition of map scale in gpsdrive? How to calculate one?
Digital raster maps have scale in for example meters/inches/foots per
pixel. How is this scale interconnected with scale written in
map_koord.txt? I obtained (for my personal use) raster map of Poland
in scales 2, 4, 8, 16, 32 meters per pixel. Map is georefereced in
'1992' coordinate system (EPSG2180 number for reference). I can
recalculate it into WGS84 so there is no problem if transformation is
linear... But even that I'm able to calculate lat/lon parameters of
the center of the map I've created I can't calculate scale...

Please don't answer ask google. I did. But question I've asked were
probably wrong. Wikipedia doesn't help either. Gpsdrive documentation
is blurry in aspects I'm asking about...

Best regards,
Pawel Bednarski