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(A). A "Distress Hot Key" MF/HF DSC Distress alert will be transmitted on 2187.5 kHz or another DSC frequency, depending on the manufacturer.
§ 80.304 Watch requirement during silence periods.
Each ship station operating on telephony on frequencies in the band 1605-3500 kHz must maintain a watch on the frequency 2182 kHz. This watch must be maintained at least twice each hour for 3 minutes commencing at x h.00 and x h.30 Coordinated Universal Time (UTC) using either a loudspeaker or headphone. Except for distress, urgency or safety messages, ship stations must not transmit during the silence periods on 2182 kHz.
Regarding 2,182 kHz see § 80.304
For a great reference on various topics, see the Title 47 Chapter I Subchapter D Part 80 - STATIONS IN THE MARITIME SERVICES on Code of Federal Regulations
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