Subject

A Tri-Color is strictly used for sailing.

An anchor light is a totally different animal.

When a sailing vessel is under power, the Tri-Color is extinguished
and a steaming configuratiom is turned on which consists of
red-green-white lights at deck level with the addition of a white
steaming light above deck level, mounted on the mast so that it does
not provide 360 degree illumination.

Lew