Garmin GPSMAP 198C Owners Manual - Page 28
DSC, When the GPSMAP 198C Sounder receives a Distress Call - gps navigator and chartplotter
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BASIC OPERATION > DSC DSC The DSC Page of the Main Menu controls and sets up the Digital Selective Calling (DSC) features on the GPSMAP 198C Sounder. Digital Selective Calling (DSC) uses marine VHF radio and Global Positioning System (GPS) technologies to transmit and receive location information. The chartplotter repeats the call properties received from the VHF radio on the chartplotter. The GPSMAP 198C Sounder requires input from a DSC enabled VHF radio to show position, and sound/show alerts from a Distress Call or Position Report. Conversely, the VHF radio requires input from a GPS to transmit position coordinates for a Distress Call or Position Report. For connection information, refer to "Connecting the Power/Data Cable" on page 99. An emergency DSC Distress Call allows a vessel in trouble to transmit a substantial amount of information in a single transmission or call, without the need for voice communication. When any nearby rescuer receives the DSC signal, an alarm sounds and they immediately receive the location of the caller. The rescuer can choose to navigate to the caller's location to assist, or forward the call on to the Coast Guard. When the Coast Guard receives the call, they can immediately access the caller's information (such as who they are and the type of vessel) in their database while they are in transit to the caller's location. A non-emergency DSC Position Report allows mariners to exchange and show the positions of one another. When a DSC position is received, the mariner can choose to create a waypoint or to show the received location on an electronic map. Anytime a vessel receives a DSC call, they can store and quickly navigate to that location using a Go To. In order to use DSC, users must first register their VHF radio with the FCC and receive a Maritime Mobile Service Identity (MMSI) number. Garmin does not provide MMSI numbers. For more information about Digital Selective Calling and Maritime Mobile Service Identity (MMSI) numbers, refer to page 104 in the "Appendix." Understanding Distress Calls When the GPSMAP 198C Sounder receives a Distress Call from a connected DSC enabled VHF radio, an alert message and notification page are shown, and an alarm tone is sounded. Distress Calls are shown in the DSC Call List, and Log with a checkered symbol. 22 GPSMAP 198C Sounder Owner's Manual