JBO is not actually giving us a lot of information on what he wants.
Is the ship stopped in the water? Well, probably or why is he trying to leave a ship while it is underway? Weather? Swell and waves? Flat calm?
Clearing the Suez Canal boats? Ship making 10 knots, painter out, the boat lowered from the crane. He boatman slipped the painter and he shot out like a rocket!