In part 3, I talked about deck, cabin, and hold illumination. But there's also a need for lighting by which the ship sees what lies around it, and is seen in turn. Lighting may also be used for communication, ship-to-ship and ship-to-shore.

 
Running lights
 

Stern Lanterns. When ships were traveling in formation at night, there needed to be a way for the helmsman on one . . .

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