Appendix X
X Radio Watch summary
Operating Vessel using Inmarsat for Vessel using HF DSC for
area Sea Area A3 coverage Sea Area A3 coverage
Distress and Safety Watch Distress and Safety Watch
from ship and from shore from ship and from shore
AI--> VHF Ch70 (DSC watch) VHF Ch70 (DSC watch)
VHF Chl6/13 (voice watch) VHF Ch 16113 (voice watch)A2--> As AI, but add As AI, but add
MF DSC on 2187·5kHz MF DSC on 2187·5kHzA3--> Distress and Safety Watch Distress and Safety Watch
from ship from ship
MF DSC on 2187·5kHz MF DSC on 2187·5kHz
VHF DSC on Ch70 VHF DSC on Ch70
VHF voice on Ch16/13 VHF voice on Ch16/13
Distress and Safety Watch Distress and Safety Watch
from shore from shore
Inmarsat EGC (SafetyNET) HF DSC on 8414.5kHz
receiver (normally part of plus one other HF DSC
an Inmarsat-C unit) frequencyA4--> All vessels must be fitted with HF DSC and maintain
the same watch as shown above, right, for vessels which
use HF DSC for A3 area coverage.Maritime Safety Information Watch
NA VTEX - Whenever your vessel is within coverage of a NAVTEX
station, you must use your NAVTEX receiver to receive MS!. Programme
the station covering your area of operation and any adjacent station if
bound for that adjacent area (see Chapter 9 of this guide for NAVTEX
operation; and Chapter 2 for 'how to choose a station' using ALRS Vo!.
5 for NAVTEX station identities and coverage).
Inmarsat EGC (SafetyNET) (and alternative/supplementary services)
When outside ofNAVTEX coverage, you would normally use the
Inmarsat SafetyNET service, (supplemented if necessary with VHF voice,
or MF/HF voice/NBDP services, where available), to receive MS!.
(SafetyNET is covered in Chap 2 and 8 of this Guide, and in ALRS Vo!.
S; VHF, MF and HF MSI services from specific Coast Stations are listed
in ALRS Vo!. 3 and explained in Chapter 2 of this Guide).
MARINE COMMUNICATIONS 241