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Requesting a Vessel's Position
Position data received from stations that respond to position request calls is sent over the NMEA
®
network. You
can track the vessels on your Garmin chartplotter.
1 Select DSC > POS. REQUEST.
2 Select an option:
• To enter the MMSI number manually, select MANUAL, enter the MMSI number, and select ACCEPT.
• To select an entry from the directory, select DIRECTORY, and select an entry.
3 Select CALL.
The radio transmits the call on channel 70 and returns to the previous channel. WAITING FOR
ACKNOWLEDGE appears on the screen.
Receiving Calls
Receiving Distress Calls and Distress Relay Calls
When receiving a distress call or a distress relay call, DISTRESS or DISTR RELAY, and information about the call,
such as MMSI number and the nature of the distress, appear on the radio screen. A distress call is sent from a
vessel in need of assistance, and a distress relay call is sent from either another vessel or a station on behalf of
a vessel in need of assistance.
The radio sends data related to the call over the NMEA network based on how you configure MMSI filters
(Configuring DSC NMEA Transmissions, page 23).
NOTE: When a distress call is received, the radio switches to channel 16 automatically after ten seconds.
When a distress call is received, select an option:
• To view additional information about the distress call and switch to channel 16, select .
• To accept the distress call and switch to channel 16, select OK.
• To review information about the distress call without switching to channel 16 automatically, select
PAUSE.
• To ignore the distress call and stay on the current channel, press CLEAR.
Receiving All-Ships Urgency and Safety Calls
When you receive an all-ships urgency or safety call, ALL SHIPS appears on the screen, and URGENCY or
SAFETY appears as the type of call. If the channel request is for an invalid channel, INVALID CH REQUEST
appears on the screen.
NOTE: When an all-ships call is received, the radio switches to the requested channel automatically after ten
seconds.
When an urgency or safety call is received, select an option:
• To view additional information about the call and switch to the requested channel, select .
• To accept the call and switch to the requested channel, select OK.
• To review information about the call without switching to the requested channel automatically, select
PAUSE.
• To ignore the call and stay on the current channel, press CLEAR.
Digital Selective Calling 15
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