Layers Library
Layers are explained in the manual, read here.

Noaa buoy position layer based on a script that parsed the NOAA data. gpx file

UK Met Office forecast areas made manually with tracks and waypoints. gpx file

Some offshore wind farm areas. A kml file converted with gpsbabel. gpx file

Another kmz file converted to a gpx file. This very large file describes all the Exclusive Economical Zones world wide. Much more on this site www.justmagic.com/GM-GE.html
Note that far from all kmz/kml are suitable for conversion. gpx file
Chart Corrections
Navigation marks and lights
List of Lights, PjotrC
Offshore Wind Farms
Windfarms, PjotrC
Windfarms, Cagney
Political
World Exclusive Economical Zones
Platforms
Platforms, PjotrC
Traffic Separations
TSS zones, PjotrC
Weather related
NOAA wx-buoy positions
UK forecast areas.
French Atlantic forecast areas.
Wrecks
Some Wrecks, PjotrC
Some examples to start the library and the discussion.

Noaa buoy position layer based on a script that parsed the NOAA data. gpx file

UK Met Office forecast areas made manually with tracks and waypoints. gpx file

Some offshore wind farm areas. A kml file converted with gpsbabel. gpx file

Another kmz file converted to a gpx file. This very large file describes all the Exclusive Economical Zones world wide. Much more on this site www.justmagic.com/GM-GE.html
Note that far from all kmz/kml are suitable for conversion. gpx file
Chart Corrections
Navigation marks and lights
List of Lights, PjotrC
Offshore Wind Farms
Windfarms, PjotrC
Windfarms, Cagney
Political
World Exclusive Economical Zones
Platforms
Platforms, PjotrC
Traffic Separations
TSS zones, PjotrC
Weather related
NOAA wx-buoy positions
UK forecast areas.
French Atlantic forecast areas.
Wrecks
Some Wrecks, PjotrC