Question 891Navigation General70% to pass
Your ARPA 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?
AI Explanation
The correct answer is D) The target's true course vector will be in error.
When an ARPA system has automatic speed inputs from the ship's log, but the ship's speed over ground is different due to currents, the calculated target's true course vector will be in error. This is because the ARPA uses the ship's speed through the water to determine the target's true course, but the actual speed over ground is different. As a result, the displayed target course vector will not accurately reflect the target's true course.
The other options are incorrect because: A) The TCPA will be earlier than the actual TCPA, not later. B) The CPA will be greater than the actual CPA, not less. C) The range of initial target acquisition will not be affected by the speed discrepancy.
Related Questions
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