1) Animates 2) Elates 3) Elevates 4) Markers 1) Bobbing markers in harbors 2) Channel chimers 3) Channel markers 4) Channel markers in harbors 5) Elevates 6) Floating markers 7) Floats 8) Floats in the harbor 9) Harbor bouncers 10) Harbor floaters 11) Harbor markers 12) Harbor sights 13) Holds up 14) Keeps afloat 15) Lifts 16) Lobster pot signposts 
Floats that warn of hazards such as rocks or shallow ground, to help ships maneuver through unfamiliar harbors.