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a flashlight
There should be both a bow light and a stern light.
While rowing a small utility boat at night a flashlight should be carried to help avoid a collision.
Flashlight
flashlight
A white masthead light must be shown when a powerboat is operating at night.
When operating a powerboat at night white light should be shown on the stern and red and green lights on the bow.
flashlight
Collision avoidance lights are used to notify other drivers of a car's presence. They run day and night as an additional safety measure.
anchor light
When operating a powerboat at night, the port side(left side) should display a red light. The starboard side(right side) should display a green light.
Today ships have radars that see through night and fog, making it possible to avoid ice bergs.