In general, a reinforced vessel can safely navigate in ice provided the concentration does not exceed how many tenths?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 5- 7 tenths
Standard ice navigation guidelines established by maritime authorities indicate that a hull-reinforced vessel can maneuver safely through ice concentrations up to 5 to 7 tenths without specialized escort, provided ice thickness and power parameters are properly matched.
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