I lock mine with the key on a ferry. This seems to work although the Range Rover driver to me, forgot to disable his alarm and his battery was flat after 30hrs on the Santander to Portsmouth ferry. Although you can take out fuse fc04 in the cockpit fuse box to put in transport mode
The alarm system has a tilt sensor which I proved by jacking up the vehicle when locked with fob and it sets the alarm off. In hind site I should have checked the alarm by jacking up when locked with the key.

The alarm system has a tilt sensor which I proved by jacking up the vehicle when locked with fob and it sets the alarm off. In hind site I should have checked the alarm by jacking up when locked with the key.

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