Drag to move, scroll or + / − to zoom. The buttons bottom right rotate and tilt; Move / Rotate sets what dragging does.
Views
Pick a view in the menu to jump there.
Briefing
Pick a route, tap Step through briefing, then Next.
Current
From north / From south changes the drift.
Depth limit
Everything deeper is shaded.
Boat & RIBs
Drag them to where you are.
Your routes
+ draws a new route; the ✎ on a route edits your version. Saved on this device.
Corrections
Suggest a correction and mark the spots on the reef.
Offline
Open the site once with internet; it then works at sea. Add it to your home screen.
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Built from dive-centre sketches and published site descriptions, not survey data. Treat depths as ±5 m. Corals are illustrative; animals are drawn about 3× life size.