Sailing in very light air, we were nearly to Marshall Island. The current - running against us - had the boat sailing pretty well, and going nearly nowhere. I got to study this toggle rig. The tide is high and with the strong current, the main buoy goes under water. At high tide, many are nowhere to be seen and if a seas running, forget it!

You guess where the buoy is by how the toggle buoy behaves. No problem here, under sail for us. The worst case is looping a prop blade(which is easy to get off).