How long and at what interval must a UMIB be broadcast?

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Multiple Choice

How long and at what interval must a UMIB be broadcast?

Explanation:
UMIBs are urgent marine information broadcasts used to quickly alert mariners to hazards or safety concerns. When a UMIB is issued, it should be broadcast for one hour and repeated every 15 minutes. This cadence helps ensure the message is received by people tuning in at different times and across different channels, without tying up the channel longer than necessary. A longer continuous transmission would waste air-time, while a shorter duration or a much longer interval could cause mariners to miss the alert. The 1-hour duration with 15-minute repeats provides a reliable balance between reach and efficiency.

UMIBs are urgent marine information broadcasts used to quickly alert mariners to hazards or safety concerns. When a UMIB is issued, it should be broadcast for one hour and repeated every 15 minutes. This cadence helps ensure the message is received by people tuning in at different times and across different channels, without tying up the channel longer than necessary. A longer continuous transmission would waste air-time, while a shorter duration or a much longer interval could cause mariners to miss the alert. The 1-hour duration with 15-minute repeats provides a reliable balance between reach and efficiency.

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