Detailed description
If you are embarking on an inland vessel that is registered for a domestic ship register, you must register at the location of the ship's home port.
If you sail on a seagoing vessel that is authorized to fly the federal flag, the shipowner will register you at the beginning of the employment, hiring or training relationship. To do this, you must provide the shipowner with the necessary information.
In both cases, there is no obligation to register if you are registered for an apartment in Germany.