For only Eur 10.- per month,I have access to detailed nautical maps in many parts
of the world from GeoGarage.
Linking to Geo Garage from within OpenCPN
using the POI feature,I have immediate and detailed access to ports
and congested navigation
areas. You can even set up POI´s linking to specific map areas.
You can create routes for planning purposes,using very detailed charts
, avoiding shallow water
and obstructions,and then save the route
as a .gpx file for later import
. See the coverage from the list on the right of the screenshots below.
A very useful utility and well worth the subscription fee.