GPSMAP 3005C Owner’s Manual
87
A
PPENDIX
>
D
IGITAL
S
ELECTIVE
C
ALLING
(DSC)
WAAS Capability
The GPSMAP 3005C is capable of receiving WAAS satellite signals. Effective
use of the WAAS satellite signal may be limited by your geographic location in
relation to those satellites, now in developmental service. WAAS satellite signal
reception requires an absolute clear view of the sky and works best when there
are no nearby obstructions such as buildings or mountains.
WAAS satellites are numbered 33 or higher when viewing the sky view on your
GPSMAP 3005C. Initial reception of the WAAS signal may take up to 15-20
minutes, then 1–2 minutes afterwards. When WAAS differential correction has
been received for GPS satellites (numbers 32 or below), a “D” appears in the
signal bar of the sky view and “Ready For Navigation with WAAS” appears in
the Status field. To learn more about the WAAS system, its satellite locations and
current state of development, visit the FAA web site (
Because WAAS requires CPU resources of the GPSMAP 3005C to search for
and track the satellites, you can disable the WAAS feature to improve unit
performance if WAAS reception is not available in your area.
To disable or enable WAAS:
1. On the
GPS
tab, highlight the
Setup
sub tab.
2. Use the
ROCKER
to highlight the
WAAS
field, and press
ENTER
.
3. Highlight
On
or
Off
, and press
ENTER
.
Digital Selective Calling (DSC)
When your Garmin GPSMAP 3005C is connected to a VHF radio with DSC
support, the GPS unit displays a Call List, Log, and a Directory to store incoming
information received from another user’s DSC capable VHF/GPS combination.
Basic wiring is required for the Garmin unit and VHF radio to send and receive
NMEA data from each other. See the
GPSMAP 3005C & GPS 17 Installation
Instructions
.
What is DSC?
Digital Selective Calling (DSC) uses marine VHF radio and Global Positioning
System (GPS) technologies to transmit and receive location information. DSC
is used by mariners to assist them in two major areas: distress calls and position
reporting.
A non-emergency DSC position report allows mariners to exchange and display
the positions of one another. When a DSC position is received, the mariner can
choose to create a waypoint or show the received position on an electronic map.
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 position of the caller.
The rescuer can then choose to navigate (Go 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 the caller is
and the type of vessel) in their database while they are in transit to the caller’s
location.
Summary of Contents for GPSMAP 3005C
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