Hi Nick,
it's a really small piece. But 0,157° x 0,0685°
and dlon=0,00027761 are about 565 x 246 points. That are a lot of 64x64
DEM tiles. I don't think, that's a problem.
Can you put the ready card (still without
DEM's) to http://www.pinns.co.uk/errs/
or whereever?
What say mapsource to your map?
Frank