Rules say anchor light must be displayed where it can best be seen...well that depends on whos looking, a small powerboat or an oil tanker. My take on the rules in general is if an accident happens everyone is at fault becuase you are charged with avoiding collissions; now one party may be more at fault than the other...Probably the only exception are vessells restricted in their movments or not under command, everyone else watch out.This is of interest as always because a stationary barge by the tappan zee bridge was struck in 2013 with fatality's
And of course almost instantly the legality of its lighting was front and center no matter the BAC level of the boats operator and it is still and active court case
There was also a thread floating around about LED anchor lights that have a blueish color being mistaken for a star, which is why there are color and intensity requirements.