Learn signals.

Indoors or on a big ship, place stools in random places.
The crew members are blindfolded and stand at one side of the room or deck.
The captain uses a horn to try and bring the crew to the other side without colliding with any stools.

Draw a line on the floor. The blindfolded crew has to follow the line by listening to the horn.
Each corner of the room is a harbour. Bring the crew from harbour to harbour using the horn.