I'm using mkgmap to install OSM on my Garmin GPS.

Lakes and rivers come out in blue on both Mapsource and the GPS, but the sea comes out white. The shoreline appears as a single thin line.

I am using pbf files of England, Scotland and Wales downloaded from geofabrik Download-Bereich.

I have the option '--generate-sea=polygons,extend-sea-sectors,close-gaps=1000' in the mkgmap command line. The 'polygons' file contains 'natural=sea [0x32 resolution 18]'.

Any suggestions as to how I might get a blue sea?

Many thanks!

Roger

Roger Calvert