🔍 Key Concepts

• Radiotelephone logkeeping requirements under 47 CFR (FCC rules) rather than Navigation Rules • Difference between required safety communications and routine/operational calls • Minimum period a vessel must retain radio logs/records for inspection

💭 Think About

• Think about why regulators want you to keep radio records: what types of incidents might need to be investigated months later? • Compare each time period with the typical time frames for marine casualty investigations and insurance claims. • Which option best matches a "minimum legal retention" period, not just what might be convenient on board?

✅ Before You Answer

• Verify that the question is asking about regulatory minimum (what you MUST do), not company policy or best practice. • Check that you are thinking of radiotelephone records/logs, not general ship’s logbook or GMDSS radio logs on SOLAS ships. • Eliminate any option that seems clearly too short for an official investigation trail, and any that seems excessively long compared to common regulatory retention periods.