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DSC Tab
Use the DSC tab (Operation mode only) to control and set up the
Digital Selective Calling (DSC) features. DSC uses marine VHF
radio, and GPS, to transmit and receive location information. DSC is
used by mariners for distress calls and position reporting.
For more information about DSC and Maritime Mobile Service
Identity (
MMSI) numbers, see pages in the “
Appendix
”.
DSC page
Understanding Distress Calls
With your GPSMAP 580/585 properly connected to a VHF radio
with DSC output, you can receive any DSC distress call within
range. An alert message appears and a tone sounds when a distress
call is received. The alarm only sounds on a distress call;
position
reports do not sound the alarm. Distress calls are broadcast to
all DSC users in radio range and appear with a blue and white
checkered icon on the DSC Call List and Log tabs.
You can enter the name of a caller, if it is known. The name of the
caller replaces the MMSI number as a reference after it is entered.
Understanding Position Reports
The Position Report operates similarly to the distress call. This type
of contact is like a phone call; no emergency
alarms are set off.
Position reports are not broadcast to all DSC users and appear with a
gold boat icon.
Receiving DSC Calls
Each time you receive a distress call or position report, a review
page opens—either a DSC Position Report page or a Distress Call
page. Both pages contain identical fields to the DSC Entry Review
page.
52
GPSMAP 580/585 Owner’s Manual
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