Shadow rendered without custom dem-poly option. We can see tiles with plain ocean fully shadowed whereas tiles with ocean and ground receive light on the ocean surface and shadows are only on the ground relief.
Artifacts along the shoreline are still present (the same like in the three colored screenshots).
After a check of the source data, it seems that artifacts are from SRTM1 data and mkgmap does the job without any error.

Global view

Three screen captures of Emerald Island GPS map taken from Basecamp on a Mac. The pictures are magnified because of the Retina display resolution.

Killary Harbour

West Connemara

West Connemara

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