Distress, Urgency & Safety Communications:
Frequencies:
Which of the following frequencies and modes is allocated for Distress alerting in GMDSS?
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Correct Answer406 MHz via EPIRB, 1626.5-1645.5 MHz via Inmarsat and Channel 70 DSC plus six (6) MF/HF DSC frequencies.
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1626.5-1645.5 MHz via Inmarsat, VHF CH-16 plus six (6) MF/HF DSC frequencies, 406 MHz via EPIRB.
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Channel 70 DSC plus six (6) MF/HF DSC frequencies, 7 voice follow-on and 6 telex follow-on frequencies.
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Mayday on VHF Channel 70 and the other six voice follow-on frequencies.
Title 47 Chapter I Subchapter D Part 80 Subpart W
§ 80.1077 Frequencies.
- 406 MHz via EPI
- 1626.5-1645.5 MHz via Inmarsat
- Channel 70 DSC
- six (6) MF/HF DSC frequencies.
For comprehensive frequency allocation info, please see:
Code of Federal Regulations regarding Frequencies
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Which of the following frequencies is designated for On-scene Distress and Safety communications?
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4209.5 kHz
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Correct Answer2174.5 kHz
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518.0 kHz
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490.0 kHz
§ 80.1077 Frequencies.
NBDP 2174.5 kHz.
Title 47 Code of Federal Regulations
NBDP, or Narrow Band Direct Printing facilitates printing as a telex, a kind of texting communication.
As part of the GMDSS, it clearly communicates an intended message, especially to those who are not too familiar with English.
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Which channel is designated for GMDSS Digital Selective Calling?
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Ch-06
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Ch-16
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Correct AnswerCh-70
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Ch-83
Digital Selective Calling (DSC) is a radio mode for broadcasting on MF, HF, and VHF standard messages.
The mode is a component of the Global Maritime Distress and Safety System, using VHF 156.525 MHz, or Channel 70.
Only messages relating to distress, safety, or calling are permitted, using digital selective calling (DSC).
See US Coast Guard FAQ regarding GMDSS
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How many MF frequencies are available for DSC Distress related calls?
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Five
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Four
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Two
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Correct AnswerOne
Title 47 - Telecommunication
§ 80.1077 Frequencies.
MF Radiotelephony 2182 kHz.
Code of Federal Regulations Frequency Tables
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How many HF frequencies are available for DSC Distress related calls?
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Correct AnswerFive
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Four
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Two
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One
Title 47 - Telecommunication
§ 80.1077 Frequencies.
HF DSC
- 4207.5 kHz or 4.2075 MHz
- 6312 kHz or 6.312 MHz
- 8414.5 kHz or 8.4145 MHZ
- 12577 kHz or 12.577 MHz
- 16804.5 kHz or 16.8045 MHz
Code of Federal Regulations Frequency Tables
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How many frequencies are available under GMDSS for DSC Distress-related calls?
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Six
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Correct AnswerSeven
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Four
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Five
Title 47 Chapter I Subchapter D Part 80 Subpart W
§ 80.1077 Frequencies.
Channel 70 DSC plus
six (6) MF/HF DSC frequencies.
- 4207.5 kHz or 4.2075 MHz
- 6312 kHz or 6.312 MHz
- 8414.5 kHz or 8.4145 MHZ
- 12577 kHz or 12.577 MHz
- 16804.5 kHz or 16.8045 MHz
- 2182 kHz or 2.182 MHz
For listing of the seven (7) frequencies, please see the table
For comprehensive frequency allocation info, please see:
Code of Federal Regulations regarding Frequencies
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