online map: OpenNauticalChart.org
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I like the idea of having a base map without all the land details of the default OSM Mapnik layer, but I think the blue color for the sea is too dark (on paper charts with INT-1 symbols most water is white).
The contrast with other features (e.g. TSS) is too low:
In this picture I changed the blue color to a lighter shade (#bedef5) and added a coastline (0.1px black line):
The "SeaChart" plugin is not found by JOSM. I tried with 9900 (stable) and 9908 (latest).
My JOSM Plugin description URL is https://josm.openstreetmap.de/pluginicons%<?plugins=>
Pages: 1