Deck General · Pollution Reporting & Regs
33 CFR Part 164 (Navigation Safety Regulations) requires vessels over 1,600 gross tons operating in U.S. waters to have the vessel's position recorded in the log at least:
- AEvery 15 minutes
- BEvery hour✓ Correct
- CEvery 4 hours
- DAt each watch change
Explanation
33 CFR Part 164 requires that vessels over 1,600 gross tons record their position at hourly intervals when underway in U.S. waters. This navigation safety regulation ensures a continuous position record that can be used in accident investigations and helps officers maintain situational awareness.
Authority: 33 CFR
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