Raymarine Ray215 manual Digital Selective Calling DSC

Operation with a Full Function Handset 4-19

Operation When the Signal is Lost or Becomes Invalid

If positional data that was previously detected becomes invalid or is no longer detected, the radio monitors the NMEA line for 1 minute for it to be restored.

If a signal is restored on the NMEA line and the radio determines the data is valid, the data is input, the NMEA indicator remains illuminated, and the radio re-enters normal operation mode.

However, if no signal is detected, the NMEA indicator flashes and a 5- second-long staccato alert tone is emitted. The last received positional data is retained in memory and can be viewed in the NAVSTAT screen. 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.

4.4.16Digital 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 a Group Call

3.Transmitting/Receiving an All Ships Call

4.Transmitting/Receiving a Distress Call

5.Receiving a Distress Relay Call