comdtinst m2400.1f - US Coast Guard Response Boat-Medium
comdtinst m2400.1f - US Coast Guard Response Boat-Medium
comdtinst m2400.1f - US Coast Guard Response Boat-Medium
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2.B.2. c. Transmission. With the exception of distress communications<br />
and urgency and safety signals, no transmission will be made on<br />
2183.4 (2182) kHz for three minutes twice each hour beginning<br />
at HX00 and HX + 30 UTC.<br />
d. Calling. Call radio stations other than <strong>Coast</strong> <strong>Guard</strong> when other<br />
means of communications are not available or not desired. (After<br />
a preliminary call to establish communications, when practicable,<br />
units shall shift to an appropriate working frequency.)<br />
e. Working Frequencies. Call <strong>Coast</strong> <strong>Guard</strong> units for the purpose of<br />
establishing communications and then shift to an appropriate<br />
working frequency for the passing of traffic. In districts<br />
where a guard is maintained on a working frequency, units<br />
should call and work on those channels.<br />
f. Broadcasts. Announce Maritime Safety Information Broadcasts.<br />
3. a. Carrier Frequencies 4125 and 6215 kHz. The carrier frequencies<br />
4125 and 6215 kHz are used to supplement the carrier frequency<br />
2182 kHz for distress and safety purposes and for call and<br />
reply. These frequencies are also used for distress and safety<br />
traffic by radiotelephony.<br />
b. Carrier Frequency 4125 kHz. The carrier frequency 4125 kHz may be<br />
used by aircraft stations to communicate with stations of the<br />
maritime mobile service for distress and safety purposes.<br />
4. 121.5 MHz: This frequency is the VHF-AM aeronautical distress<br />
frequency, also used by aircraft Emergency Locator Transmitter<br />
(ELT's), ship Class A, B, S and Category I EPIRB's, and<br />
COSPAS-SARSAT Search and Rescue Satellite-Aided Tracking system<br />
distress alerting and locating. <strong>Coast</strong> <strong>Guard</strong> units may use 121.5 MHz<br />
to transmit (from aircraft, or using an EPIRB), or receive distress<br />
calls and messages. Class A EPIRB's are automatically activated,<br />
float free devices, and Class B and S EPIRB's are manually activated<br />
devices. Class S EPRIB's, intended for survival craft, are designed<br />
to float.<br />
5. 156.8 MHz: The VHF-FM frequency 156.8 MHz is the International<br />
distress, safety and calling voice frequency in the 156-162 MHz band<br />
for the maritime mobile service. The frequency may be used by ship<br />
radiotelephone stations to request assistance from maritime services.<br />
It may be used for distress calls and distress traffic and for urgency<br />
And safety signals and urgency and safety messages. In addition<br />
it may be used for call and reply, for signals preparatory to traffic,<br />
and by coast radiotelephone stations to announce transmissions, on<br />
other frequencies, which are of general interest to ship stations<br />
including ordinary weather and hydrographic information. It is also<br />
used by Class C EPIRB's for distress alerting purpose. 156.8 MHz<br />
must not be used for the transmission of any traffic other than<br />
specified above. <strong>Coast</strong> <strong>Guard</strong> units may use 156.8 MHz as follows:<br />
a. Distress Calls. Transmit and receive distress calls<br />
and distress messages.<br />
2-3
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