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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6.B.4. Operational Areas. Operational areas have been designated to<br />
determine equipment carriage requirements for vessels and appropriate<br />
communication systems to employ for distress alerting and<br />
communications (see paragraph L below).<br />
(a) Area A1 - within range of shore based VHF stations<br />
(b) Area A2 - within range of shore based MF stations (excluding A1<br />
areas)<br />
(c) Area A3 - within the coverage area of geostationary satellites<br />
for maritime communications (excluding A1 and A2 areas)<br />
(d) Area A4 - outside the coverage area of geostationary satellites<br />
5. INMARSAT. Satellite communications may be used in both the<br />
ship-to-ship and shore-to-ship directions. The INMARSAT<br />
system, which uses geostationary satellites and operates in<br />
the 1.5 to 1.6 GHz bands, will provide a means of alerting<br />
from ships and for two way communications using radiotelephone<br />
and NBDP. Polar orbiting SARSAT satellites will provide a<br />
means of distress alerting and position location of EPIRBs in<br />
the 406 - 406.1 MHz band. Basic ship-board equipment will<br />
consist of a ship earth station, approved by INMARSAT<br />
(Standard A or C terminal), and satellite EPIRBs.<br />
6. HF. HF will provide long range communications in the<br />
ship-to-shore and shore-to-ship directions. In areas covered<br />
by INMARSAT, HF can be used as an alternative to satellite<br />
communications. Outside these areas it will provide the only<br />
communications capability. Frequencies have been designated<br />
in the 4,6,8,12 and 16 MHz bands to provide for distress<br />
alerts, safety calls and for passing distress and safety<br />
traffic. HF distress and safety traffic will be transmitted<br />
by radiotelephony and/or NBDP.<br />
7. DSC. DSC will be used for distress alerting and safety calling.<br />
Choice of the appropriate band to use will be determined by the<br />
geographic area to be covered and propagation conditions. Current<br />
planning is for ships using the HF option to maintain a watch on the 8<br />
MHz alerting frequency and one other HF frequency appropriate for the<br />
Area in which the ship is operating. The <strong>Coast</strong> <strong>Guard</strong> will use DSC<br />
primarily as a means of initiating a radiotelephone (voice) call.<br />
8. MF. MF will provide medium range communications in the ship-to-shore,<br />
ship-to-ship and shore-to-ship directions. Distress alerts and safety<br />
calls by DSC will be on 2187.5 kHz. Disresss and safety traffic by<br />
radiotelephony, including SAR coordinating functions and on scene<br />
communications will be on 2182 kHz. Distress and safety traffic by<br />
NBDP will be on 2174.5. Navigational and meteorological warnings<br />
using the NAVTEX system will be on 518 kHz. A complement of HF NBDP<br />
Channels will be available on 1 July 1991 to provide high sea maritime<br />
safety information. The frequency 490 kHz will be available at a<br />
later date to supplement NAVTEX in the shore-to-ship direction.<br />
6-2