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[mkgmap-dev] Flooded islands

From 7770 7770 at foskan.eu on Sun Mar 14 19:27:56 GMT 2021

I noted that many of the islands in the Åland archipalago (between Sweden and 
Finland) are flooded.
On a GPS unit (gpsmap 66st) the land looks like land, but when howering the 
pointer over the area it shows the name of the sea, not the name if the 

In qmapshack the islands look flooded.
I checked one of the islands (Eckerö, which is westernmost) in JOSM, i could 
not find any disconnected section nor any self crossing lines or similar 

I do use the pre-made sea data when i run mkgmap.
I also tried running without the pre-made sea data, but it did not change the 
flooding of these islands.

Two screenshots from qmapshack added to the file upload:

What could be the reason for the flooding?


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