Garmin GPSMAP 3010C - Manual (Page 112)

10 GPSMAP 3006C/3010C Owner’s Manual
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WAAS Capability
The GPSMAP 3006C/3010C 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 3006C/3010C. 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 ( gps.faa.gov ). Because
WAAS requires CPU resources of the GPSMAP 3006C/3010C 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 capability:
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 GPSMAP 3006C/3010C 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 3006C/3010C & 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 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 information (such as who they are
and the type of vessel) in their database while they are in transit to the caller’s
location.