The anchor light at the top of the mast should not be used by a sailboat underway at night. Frequently it is left on when leaving an anchorage along with the steaming and navigation lights.
An anchor light.
An anchor light should never be used while moving.
anchor light
no never
It is a rule - so never
It is a rule - so never
Of course, without navigation it will never get to its destination.
It is a rule - so never
Lighthouses are beacons, but not all beacons are lighthouses. "Some definitions are not controversial. An aid to navigation is a structure placed on or near navigable water to provide visual guidance to mariners.A beacon is an aid to navigation that is fixed in place (that is, not floating). A lighted beacon or light beacon is a beacon displaying a light, while an unlit beacon is called a day beacon.Often, a lighted beacon is simply called a light." Not all day beacons are lighthouses, because beacons can be unlit. Lighthouses can be decommissioned, but if they were never lit, they were never real lighthouses.
It is a rule - so never
Radar. Satellite navigation.
In the U.S., there are things that you must never do with an American flag. The flag must always be lighted, either by sunlight or artificial light. The flag should never be dipped to any thing or any person. You should never use the flag as a form of advertisement.