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Understanding Distress Calls
With your GPSMAP 378/478 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 a caller’s name, if it is known. The caller’s name
replaces the MMSI number as a reference once 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 elds to the DSC Entry Review
Page.
Each entry in the Call List and Log has a corresponding DSC Entry
Review Page. This page operates similarly to the Distress Page and
Position Report Page. From the DSC Entry Review, you can Delete
the entry, Save it as a waypoint, or show the location on the map.
To review a call or log entry:
1. Open the Call List or Log from the DSC tab.
2. Highlight the call you want to review.
3. Press ENTER to open the DSC Entry Review Page.
DSC Entry Review Page
72 GPSMAP 378/478 Owner’s Manual
MAIn Menu > dsc tAb
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