GPSMAP 392/398/492/498 Owner’s Manual 21
BASIC OPERATION > ADDITIONAL INFORMATION AND DSC
Additional Information
Each item on the map has information about the point available.
The information varies depending on the type of data loaded on
the optional data card. Sub tabs along the top of the detail window
contain the information available for the item. Any additional
options are shown along the bottom.
To view additional information for a Map item:
1. On the Map Page, use the ROCKER to highlight a map
item, and press ENTER.
2. Use the ROCKER to highlight the individual tabs, and show
the information. To scroll the text, highlight the field, and
press ENTER. Use the ROCKER to scroll.
Information Window
Additional
information tabs
Additional options
Distance, Bearing,
and Coordinates of
item
DSC (Digital Selective Calling)
The DSC tab controls and sets up the DSC features on the
GPSMAP 392/398/492/498.
DSC uses marine VHF radio and GPS technologies to transmit
and receive location information. The chartplotter repeats the call
properties received from the VHF radio on the chartplotter. The
GPSMAP 392/398/492/498 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 92.
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
