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?

Correct Answer: Option C — Minimum speed estimate

When steaming against an adverse current, using an underestimated or minimum speed over ground ensures the navigator plots a position further offshore than actual, providing a conservative safety margin from coastal navigation hazards.