A vessel certified for service in Sea Area A3 is required to maintain a watch on:

(C). VHF Channel 70, MF Frequency 2187.5 kHz, HF on 8414.5 kHz and one other HF DSC frequency.

47 CFR 80.1085(a)(2) A dedicated, non-scanning radio installation capable of maintaining a continuous DSC watch on VHF channel 70 which may be separate from, or combined with, that required by paragraph (a)(1)(i) of this section;

47 CFR 80.1071(c)(2) The ship remains within coverage of a VHF coast station and maintains a continuous watch on VHF Channel 16; or

47 CFR 80.1071(c)(3) The vessel remains within coverage of an MF coast station and maintains a continuous watch on 2182 kHz and VHF Channel 16.

47 CFR 80.1091(a)(3) A radio installation capable of maintaining a continuous DSC watch on the frequency 2187.5 kHz which may be separate from or combined with, that required by paragraph (a)(1)(i) of this section; and

47 CFR 80.1091(a)(1)(iii) An INMARSAT ship earth station capable of: Maintaining watch for shore-to-ship distress alert, including those directed to specifically defined geographical areas;

§ 80.1077 Frequencies. (2) For ships equipped with MF/HF equipment, there is a watch requirement on 2187.5 kHz, 8414.5 kHz, and one other frequency. MF/HF DSC2 2187.5 kHz3, 4207.5 kHz, 6312 kHz, 8414.5 kHz, 12577 kHz, and 16804.5 kHz.

Code of Federal Regulations Title 47 Chapter I Subchapter D Part 80 Subpart W Global Maritime Distress and Safety System (GMDSS)

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A vessel certified for service in Sea Area A-2 is required to maintain watch on:

(D). 2187.5 kHz

47 CFR 80.1091(a)(3) A radio installation capable of maintaining a continuous DSC watch on the frequency 2187.5 kHz which may be separate from or combined with, that required by paragraph (a)(1)(i) of this section; and

§ 80.1077 Frequencies. (2) For ships equipped with MF/HF equipment, there is a watch requirement on 2187.5 kHz, 8414.5 kHz, and one other frequency. MF/HF DSC2 2187.5 kHz3, 4207.5 kHz, 6312 kHz, 8414.5 kHz, 12577 kHz, and 16804.5 kHz.

Code of Federal Regulations Title 47 Chapter I Subchapter D Part 80 Subpart W Global Maritime Distress and Safety System (GMDSS)

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What are the mandatory DSC watchkeeping bands/channels?

(A). 8 MHz HF DSC, 1 other HF DSC, 2 MHz MF DSC and VHF Ch-70.

See US Coast Guard, article on RADIO WATCHKEEPING REGULATIONS

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Proper watchkeeping includes the following:

(B). After silencing an alarm all displays and/or printouts are read, monitoring all required frequencies in the proper mode, notifying the Master of any Distress alerts.

47 CFR 80.1121(a) Ship or ship earth stations that receive a distress alert must, as soon as possible, inform the master or person responsible for the ship of the contents of the distress alert. Reference

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Proper watchkeeping includes the following:

(B). Maintaining a proper GMDSS radio station log, understanding normal operational indicators, responding to and comprehending alarms.

§ 80.1075 Radio records. A record must be kept, as required by the Radio Regulations and § 80.409 (a), (b) and (e), of all incidents connected with the radiocommunication service which appear to be of importance to safety of life at sea. Reference

§ 80.409 Station logs. The log must be kept in an orderly manner. The log may be kept electronically or in writing. The required information for the particular class or category of station must be readily available. Key letters or abbreviations may be used if their proper meaning or explanation is contained elsewhere in the same log. Reference

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Which is true concerning a required watch on VHF Ch-16?

(C). When a vessel is in an A1 sea area and subject to the Bridge-to-Bridge act and in a VTS system, a watch is not required on Ch-16 provided the vessel monitors both Ch-13 and the VTS channel.

From Title 47 Chapter I Subchapter D Part 80 Subpart W Global Maritime Distress and Safety System (GMDSS)

§ 80.1069 Maritime sea areas.
47 CFR 80.1069(a)(1) Sea area A1. An area within the radiotelephone coverage of at least one VHF coast station in which continuous DSC alerting is available as defined by the International Maritime Organization.

47 CFR 80.1071(c)(2) The ship remains within coverage of a VHF coast station and maintains a continuous watch on VHF Channel 16; or

47 CFR 80.1071(c)(3) The vessel remains within coverage of an MF coast station and maintains a continuous watch on 2182 kHz and VHF Channel 16.

§ 80.309 Watch required by the Bridge-to-Bridge Act. In addition to the watch requirement contained in § 80.148, all vessels subject to the Bridge-to-Bridge Act must keep a watch on the designated navigational frequency. The watch must be maintained by the master or person in charge of the vessel or the person designated by the master or person in charge to pilot or direct the movement of the vessel. The person standing watch may perform other duties provided such other duties do not interfere with the watch. Reference

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