NavShip offers OpenSeaMap maps, but you can also save data in online mode with the Google Maps map by saving the Google Maps map of your sailing area offline.
All you have to do is open the Google Maps app on your device (works for both iOS and Android, for iOS you may need to download the Google Maps app from the AppStore first) and follow these instructions: https://support.google.com/maps/answer/6291838?hl=en&sjid=5430277840112049048-EU
Enjoy planning your route!
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