Question 705Navigation General

70% to pass

Your Electronic Plotting Aid (EPA) has automatic speed inputs from the log. Due to currents, the log is indicating a faster speed than the speed over the ground. What should you expect under these circumstances?

A The generated CPA will be less than the actual CPA.
B The generated TCPA will be later than the actual TCPA.
C The range of initial target acquisition will be less than normal.
D The targets true course vector will be in error.
AI Explanation

The correct answer is D) The target's true course vector will be in error. When the log is indicating a faster speed than the actual speed over the ground due to currents, the Electronic Plotting Aid (EPA) will calculate the target's true course vector based on the faster log speed. This will result in an error in the displayed true course vector, as it will not accurately reflect the target's actual course over the ground. The other options are incorrect because: A) The generated CPA will be less than the actual CPA, not more. B) The generated TCPA will be earlier than the actual TCPA, not later. C) The range of initial target acquisition will not be affected by the log speed error.

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