Question 984Navigation General

70% to pass

The radar control used to reduce sea return at close ranges is the _______________.

A sensitivity time control
B fast time constant
C gain control
D pulse length control
AI Explanation

The correct answer is A) sensitivity time control. The sensitivity time control (STC) on a radar system is used to reduce the impact of sea clutter (return from waves) at close ranges. STC works by reducing the receiver's sensitivity at short ranges, which helps to suppress the strong radar returns from the nearby waves and choppy sea surface. This allows the operator to better distinguish targets of interest from the background sea clutter. The other options are incorrect because they do not specifically address the reduction of sea clutter at close ranges. The fast time constant, gain control, and pulse length control serve other purposes in radar operation, but do not directly reduce sea return as the sensitivity time control does.

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