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3-16 Operation with Minimum Function Handset
However, if no signal is detected, the NMEA indicator flashes and a 5-
second-long staccato alert tone is emitted. 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 using the Full
Function Handset 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.
3.5.18 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 RAY215E 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 equipped with appropriate DSC equipment know where you are
and that you are in a Distress situation.
In the RAY215E, Class “D” DSC functionality is enabled by installing an
optional Full Function Handset. This can be in the form of Single Station
(Raymarine part number E46020) that replaces the Minimum Function
Handset or as a Dual Station (Raymarine part number E46022) that, when
used in conjunction with a Minimum Function Handset, enables intercom
functions between the two stations.
Note: DSC functions are enabled only when an optional Full Function
Handset has been installed. If no Full Function Handset is attached,
none of the following features will operate.
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)