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Digital Selective Calling (DSC)
Appendix B
with the MMSI number attached to the call (if the user has DSC support). Any DSC-equipped mariner
(on sea or land) within range can receive the call.
When the Garmin GPSMAP 182/182C/232 is connected to a VHF with DSC support, the GPS unit
displays a Call List, Log, and a Directory available to store incoming information received from another
user’s DSC capable VHF/GPS combination. Basic wiring is required for the Garmin unit and VHF radio
to send and receive NMEA data from each other (pg.87).
Distress Call
With a Garmin DSC capable chartplotter/sounder properly connected to a VHF radio with DSC
output, the user may receive any DSC Distress Call within range. A window will pop up and a message
will display when a Distress Call is received. To notify the user a Distress Call has been received, an
alarm will sound (if enabled). The alarm only sounds on a Distress Call, and it will not sound on a
Position Report. Distress Calls are broadcasted to all DSC users in radio range.
Options available from this screen are:
• Show on Map: If the user immediately wants to see the caller’s position they select ‘Show on
Map’.
• Create Waypoint: If the user wanted to create a waypoint of that posistion they highlight
‘Create Waypoint’ and press ENTER/MARK.
The user also has the ability to input the user’s name, if it is known. (NOTE: The user’s name
replaces the MMSI number as a reference once it is entered.)
DSC Position Report
The Position Report operates similarly to the Distress Call. Remember this type of contact is like a
phone call, but no emergency alarms are set off and the call is specific to the receiver. Position Reports
are not broadcasted to all DSC users.
Distress Call Message
Position Report Message