MVDV> VD>  I know (and listen) signals from beacons (lighthouses) on the sea.

MVDV>It was abandonned as an *official* means of communication. Yes, there are
MVDV>beacons still using morse code as an *unofficial* means of
MVDV>identification. Both maritime and aviation. That is just
MVDV>inertia and I dont think no one but a few oddballs actually
MVDV>use these beacons any more for navigation.

The electronic signals are of more use unless you are in a tiny fishing
ship.  Chances are by the time you could see a lighthouse beacon, it's a
wee bit late in anything bigger .
         xxcarol

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