COMDTINST 16121.1
JAN 29 1998
(2)
NAVTEX: Narrow-Band Direct-Printing Telegraphy for transmission of
navigational and meteorological warnings and urgent information to ships on
MF.
(3)
SITOR: Simplex Teletypewriter over Radio for ship-to-shore communications
and transmissions of MSI.
(4)
INMARSAT A (analog) and B (digital): For ship/ship and shore/ship
communications utilizing satellite. It can be interconnected to public switched
telephone and data networks.
(5)
INMARSAT C: For distress alerting, data communications and reception of
MSI.
(6)
Voice Broadcast: For transmission of MSI via VHF-FM/MF/HF.
(7)
SART: Search and Rescue Transponder. For locating survival craft.
(8)
Satellite EPIRB: Satellite Emergency Position-Indicating Radiobeacon. For
locating survivors of distress incidents (406 MHz and INMARSAT-E, 1645
MHz)
e.
GMDSS Coverage Areas:: GMDSS Area A1 may not be declared effective in the
United States until sometime during or after 2001. The United States intends to declare
GMDSS Area A2 fully effective by the GMDSS effective date. GMDSS Areas A3 and
A4 are effective by international agreement and need not be declared effective by the
United States.
(1)
Sea Area A1: VHF-FM Range - Coastal Area to approximately 20 miles
offshore within the radiotelephone coverage of at least one VHF coast station
with continuous DSC alerting capabilities. Sea Area A1 must be declared
effective by a signatory nation. The United States may declare A1 effective for
specific geographic areas.
(2)
Sea Area A2: MF Range - The area beyond VHF-FM coverage to
approximately 200 miles offshore within the radiotelephone coverage of at least
one MF station with continuous DSC alerting capabilities. Sea Area A2 must be
declared effective by a signatory nation. The United States may declare A2
effective for specific geographic areas.
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