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3-14 Operation with a Fist Microphone
The message NO GPS appears in NAVSTAT in the position where the
type of device used to be. The NMEA indicator continues to flash until
valid positional data is received. If valid positional data (from the same
source) is later restored, the NMEA indicator is again displayed solid.
Operation When No Signal Detected for 4 Hours
If no valid positional data is received or input manually within 4 hours of
the previous alert, the NMEA indicator continues to flash and the staccato
alert tone is again emitted. This pattern is repeated every 4 hours if no
positional data has been detected. If no manual input was made during
the previous 23.5 hours, all the position fields are set to 9’s and the time
and date fields are set to 8’s.
3.3.17 Digital Selective Calling (DSC)
The Digital Selective Calling (DSC) protocol is a globally applied system
used to send and receive digital Distress calls as well as Individual and
All Ships calls on channel 70, the dedicated DSC channel for Marine
VHF. For a Distress call transmission, your RAY215 takes the position
and time information from the input NMEA data along with your Maritime
Mobile Station Identifier (MMSI) and converts it into a digital "packet".
When transmitted, this digital information lets other ships and shore
stations know where you are and that you are in a Distress situation.
Communications in DSC mode include the following:
1. Transmitting/Receiving an Individual Call
2. Transmitting/Receiving an All Ships Call
3. Transmitting/Receiving a Distress Call (without designating type)
4. Receiving a Distress Relay Call (without designating type)
Individual, All Ships and Group DSC calls come in three varieties:
ROUTINE for normal calls, SAFETY for advisory alerts, and URGENCY
for assistance when life is not in immediate danger. To enable DSC mode,
press and release the DSC/PRI and D/L/ I.C. keys simultaneously. The
DSC indicator illuminates and a tone sounds. Since the Distress Call
(enabled by pressing and holding the Distress Key for 4 consecutive
seconds) automatically selects the DSC mode, it is not necessary to press
the DSC/PRI and D/L / I.C. to make a distress call.
When a DSC call is received, the radio automatically enters DSC mode if
you are currently on a selected working channel, in the Monitor mode, or
in the Scan mode. You will not receive a DSC call if the radio is transmitting
or receiving a non-DSC call.