[ gpsdrive ] Map projection

[Petra Galuscakova]

Hello,
I would like to ask you, in which projection  the maps that are
displayed in Gpsdrive are. I`ve found, that it`s Miller projection.
Could you confirm that?

I would like to use gdalwarp software to translate my map into the
projection which Gpsdrive maps uses, but I`m not sure how to do it. My
map is in S-JTSK projection (ESRI 102067).
 I have tried to translate it into Miller projection (EPSG 53002).
To do that I have used next:  gdalwarp -s_srs "+init=esri:102067"
-t_srs "+init=epsg:53002" map_file0025g.gif map_file0025t.gif
I`ve compared this map with expedia map from the same area and the
same scale (downloaded by Gpsdrive) and I found some differences.
Am I doing something wrong or are there possible some differences
between maps?  Am I using appropriate epsg number?

Thanks you beforhand,
Petra