Learn the lights of boats, bridges and locks.

Put a silhouette of a boat on the ground in front of the group.
The team leader calls out the light he/she wants to see.
In turn, one of the crew brings a coloured card and puts it in the right place on the silhouette to represent a ship’s light.

Make a competition or relay race among the crews. Play the game blindfolded, with the team members calling out instructions using nautical terms.