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3-32 Operations
If a signal is restored on the last detected line (SeaTalk or NMEA) 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.
3.5.25 SeaTalk Operation
The RAY230/RAY230E can receive SeaTalk position and time information
from any SeaTalk capable device. As with NMEA data, if the position
information becomes invalid or is not present, you will be prompted to
manually input position data.
3.5.26 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.
DSC operation includes 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
Actually, the RAY230/E has a separate receiver exclusively for Channel
70 so that even if receiving under normal operation, the unit can quickly
switch over to Channel 70 upon receiving a DSC signal. When the DSC
signal is received, the unit performs the corresponding operation. If the
radio is transmitting, however, receiving on Channel 70 is disabled.