One plan for the centre — not one per boat. Fill it in, print the A4, put
it on the wall and in the first-aid kit, and let divers scan the square.
Nothing you type here leaves this browser. There is no server, no
account and no upload. The plan is saved on this device only, so you can come back and
change it, and it travels to a diver's phone inside the printed QR square itself.
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The plan
Reprint the sheet when it is more than 180 days old — a scanning phone warns the
diver after that, and so it should. Phone the hospital and the chamber yourself before
you write them down: a plausible wrong number at two in the morning is worse than a
blank line.