Marker buoys are still a thing

Southernmost point buoy - Wikipedia

Mississippi River Channel Marker Buoys : r/uscg

Marker Buoy

Regulatory Buoy, Channel Markers

Channel markers are ideal for marking marine channels, swim areas or for conveying many types of waterfront information. They are highly visible and

Regulatory Buoys and Channel Markers

Marker Buoy

3,449 Buoy Marker Stock Photos - Free & Royalty-Free Stock Photos

Marker buoys are still a thing

What do all those buoys and markers mean? - Dorset Marine Training

Why carry a (Delayed) Surface Marker Buoy (DSMB)?

How to Use Marker Buoys For Offshore Fishing - Wired2Fish

BCGS Tip 34 - Marker Buoy Camo