Harbours, even when offline
Keep the directory with you at sea.
Blue Planet Harbours is free, so there is nothing to unlock before you go off the grid — just save what you need.
Save the pages before you leave
Open the country and harbour pages you plan to visit while you still have signal — your browser keeps them available offline.
Charts keep their last tiles
The world chart caches the tiles you have already viewed, so revisiting an area at anchor costs no data.
Screenshot the formalities
Screenshot each port of entry's phone number and reporting instructions from the Customs & immigration page.
Back online
Any connection — marina Wi-Fi, a hotspot, even a coastal signal — refreshes everything to the latest listings.