You can take medical oxygen on board in quantities sufficient for personal use.
A maximum of 6 x 10 litres (aggregate water volume) cylinders may be carried in your vehicle. The cylinders must be adequately secured in the vehicle against the movement of the ship, be stored away from sources of heat and ignition and must be shut off during the sailing.
Only 1 cylinder can be taken to the public areas and must be used only in non-smoking areas as designated by the ship's captain. Passengers should contact firstname.lastname@example.org prior to travel to discuss their needs.