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Main Menu: DSC Tab
Reference
HOW CAN GARMIN HELP YOU WITH DSC?
To receive Distress Calls or Position Reports, you must have a DSC-equipped chartplotter as well as a
VHF radio with DSC support. During normal, non-emergency Position Report communication, Channel
70 (156.525 MHz) has been set aside as the VHF/DSC digital call channel. For a Distress Call, a mariner
presses the MayDay button on their VHF radio. The call transmits on an emergency channel with the
MMSI number attached to the call (if you have DSC support). Any DSC-equipped mariner (on sea or
land) within range can receive the call.
When the Garmin GPSMAP 178/178C 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 (see page 96).
DSC Distress Call
With a Garmin DSC capable chartplotter/sounder properly connected to a VHF radio with DSC
output, you may receive any DSC Distress Call within range. A window pops up and a message dis-
plays when a Distress Call is received. To notify you a Distress Call has been received, an alarm sounds
(if enabled). The alarm only sounds on a Distress Call, and it does 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 you immediately want to see the caller’s position they select ‘Show on Map’.
• Create Waypoint: If you want to create a waypoint of that position, highlight ‘Create Waypoint’
and press ENTER/MARK.
You also have the ability to input a caller’s name, if it is known. (The caller’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