Question 1806Navigation General

70% to pass

You are running parallel to the coast and estimate that the current is against you. In plotting a running fix using bearings from the same object on the coast, the greatest safety margin from inshore dangers will result if what speed is used to determine the fix?

A Average speed estimate
B A running fix should not be used under these conditions.
C Minimum speed estimate
D Maximum speed estimate
AI Explanation

The correct answer is C) Minimum speed estimate. When running parallel to the coast with a current against you, using the minimum speed estimate to determine the running fix will provide the greatest safety margin from inshore dangers. This is because the minimum speed estimate will result in the fix being plotted further offshore, giving you more room to maneuver and avoid potential hazards closer to the coastline. The other options are not correct because: A) the average speed may not provide enough safety margin, and B) a running fix should be used in this situation, not avoided. D) Using the maximum speed estimate would plot the fix closer to the coast, reducing the safety margin.

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