Question 727Navigation General

70% to pass

You are radar scanning for a buoy fitted with a racon. In illustration D017NG below, which radar screen represents the presentation you should expect on the PPI?

Diagram for USCG Navigation General: You are radar scanning for a buoy fitted with a racon. In illustration D017NG...
A A
B B
C C
D D
AI Explanation

The correct answer is B. The illustration D017NG shows a buoy fitted with a racon (radar beacon). When a racon is detected by the radar, it will produce a distinct "dash" or "bloom" on the radar display, as shown in option B. This is the expected presentation on the PPI (Plan Position Indicator) when radar scanning for a buoy with a racon. The other options do not accurately represent the radar presentation of a racon-equipped buoy. Option A shows a simple target echo, option C depicts a more complex radar image, and option D does not appear to show a racon indication at all.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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