Hi WanMil,
What you see is the result of the multipolygon algorithm that cuts the sea areas into distinct polygons to cut out the land area. The white stripes are the polygon lines. But there is no space between the polygons. So obviously that should not the problem. The problem is that Garmins draw algorithm seems to create the white lines.
well, sorry, I meant the thin areas, not the white stripes between. These thin areas are likely to be thrown away when coordinates are rounded. I think this explains the white stripes that I see in the QLandkarte GT screenshot.
Once again: It does not make sense to improve the PrecompSeaGenerator because the main task it does is to calculate the multipolygons. And so the only thing that could be improved is the mp algorithm itself.
yes, I agree. So I'll try to find a better mp algorithm. Gerd