Question 989Navigation General

70% to pass

The radar control that shortens all echoes on the display and reduces clutter caused by rain or snow is the .

A sensitivity time control (sea clutter control)
B fast time constant (differentiator)
C brilliance control
D receiver gain control
AI Explanation

The correct answer is B) fast time constant (differentiator). The fast time constant, or differentiator, is the radar control that shortens all echoes on the display and reduces clutter caused by rain or snow. This control effectively eliminates the longer-lasting echoes from precipitation, which helps to improve target detection and identification on the radar display. The other options are incorrect because: A) The sensitivity time control (sea clutter control) is used to reduce clutter from the sea surface, not precipitation. C) The brilliance control adjusts the overall brightness of the radar display, not the echo lengths or clutter reduction. D) The receiver gain control adjusts the overall sensitivity of the radar receiver, not the specific processing of echoes.

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