Related Clues:

• Water mark?
• Boating area marker
• Ocean marker
• Waterway marker
• Hazard marker
• Bay bobber
• Channel tinkler
• Something often seen heaving on 'Baywatch'
• Bobbing sea marker
• Ocean floater with a bell
• Cheer (up)
• Floating marker
• Keep afloat
• Gull's counterpart, in a maritime pun
• Floater for boaters