A Racon is a radar transponder commonly used to mark maritime

A Racon is a radar transponder commonly used to mark maritime navigational hazards. The word is a portmanteau of RAdar and beaCON.

When a racon receives a radar pulse, it responds with a signal on the same frequency which puts an image on the radar display. This takes the form of a short line of dots and dashes forming a Morse character radiating away from the location of the beacon on the normal plan position indicator radar display. The length of the line usually corresponds to the equivalent of a few nautical miles on the display.

Within the United States, the United States Coast Guard operates about 80 racons, and other organisations also operate them, for example the owners of oil platforms. Their use for purposes other than aids to navigation is prohibited, and they are used to mark:

* lighthouses and navigation buoys
o by far the majority are on buoys rather than lighthouses. For example, at Boston Harbor, only the Boston Lighted Whistle Buoy B and the North Channel Entrance Lighted Whistle Buoy NC have racons (showing "B" and "N", respectively)[1]

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