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Getting Started
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Reference
DSC Tab— allows to control and set up DSC (Digital Selective Calling) features on the unit.
What is Digital selective calling (DSC)?
Digital Selective Calling (DSC) uses marine VHF radio and Global Positioning System (GPS) technolo-
gies to transmit and receive location information. DSC is used by mariners to assist them in two major
areas: Distress Calls and Position Reporting.
An emergency DSC Distress Call allows a vessel in trouble to transmit a substantial amount of infor-
mation 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 position of the caller.
The rescuer may then choose to navigate (Go To) the caller’s position 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 informa-
tion (such as who they are and the type of vessel) in their database while they are in transit to the caller’s
position.
A non-emergency DSC Position Report allows mariners to exchange and display the positions of one
another. Once a DSC position is received, the mariner may choose to create a waypoint or to show the
received position on an electronic map.
Any time a vessel receives a DSC call, they can store that location and quickly navigate to that position
using a Go To. This makes DSC a time-saver, especially in an emergency situation. In order to use DSC,
users must fi rst register their VHF radio with the FCC and receive a Maritime Mobile Service Identity
(MMSI) number.
What is a Maritime mobile service identity (MMSI)?
Maritime Mobile Service Identity (MMSI) basically allows a VHF radio to act like a phone. In order to
make a “call” on a phone, you fi rst need a phone number to dial. The 9-digit MMSI number acts like a
phone number when used in a Position Report and as a unique identifi er to the Coast Guard when used in
an emergency Distress Call. In order to obtain a Maritime Mobile Service Identity (MMSI) number, users
must register their VHF radio with the FCC (Form 605). Garmin does not supply this number!
DSC Tab
Main Menu: DSC Tab
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