An anchor light should never be used while moving.
anchor light
An anchor light.
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.
no never
Never. A properly operating AC unit will have no leaks, thus never need recharging.
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
Operating systems are being created and improved constantly, so there is not, and will hopefully never be, a "last" operating system.