Day Skipper Quiz · Buoyage 
A buoy. Body: red. Topmark: a red can (a flat-topped cylinder).
Entering harbour from seaward in Europe (IALA A), how do you pass this mark?
Show the answer
Keep it on your port side (to your left). A red can is a port-hand lateral mark. Going upstream or into harbour in IALA A, keep it to port.