Garmin GPSMAP 3005C Owner's Manual

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GPSMAP 3005C Owner’s Manual 87APPENDIX > D IGITAL SELECTIVE CALLING (DSC)WAAS CapabilityThe GPSMAP 3005C is capable of receiving WAAS satellite signals. Effectiveuse of the WAAS satellite signal may be limited by your geographic location inrelation to those satellites, now in developmental service. WAAS satellite signalreception requires an absolute clear view of the sky and works best when thereare no nearby obstructions such as buildings or mountains.WAAS satellites are numbered 33 or higher when viewing the sky view on yourGPSMAP 3005C. Initial reception of the WAAS signal may take up to 15-20minutes, then 1–2 minutes afterwards. When WAAS differential correction hasbeen received for GPS satellites (numbers 32 or below), a “D” appears in thesignal bar of the sky view and “Ready For Navigation with WAAS” appears inthe Status field. To learn more about the WAAS system, its satellite locations andcurrent state of development, visit the FAA web site (http://gps.faa.gov).Because WAAS requires CPU resources of the GPSMAP 3005C to search forand track the satellites, you can disable the WAAS feature to improve unitperformance 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 DSCsupport, the GPS unit displays a Call List, Log, and a Directory to store incominginformation received from another user’s DSC capable VHF/GPS combination.Basic wiring is required for the Garmin unit and VHF radio to send and receiveNMEA data from each other. See the GPSMAP 3005C & GPS 17 InstallationInstructions.What is DSC?Digital Selective Calling (DSC) uses marine VHF radio and Global PositioningSystem (GPS) technologies to transmit and receive location information. DSCis used by mariners to assist them in two major areas: distress calls and positionreporting.A non-emergency DSC position report allows mariners to exchange and displaythe positions of one another. When a DSC position is received, the mariner canchoose 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 asubstantial amount of information in a single transmission or “call” withoutthe need for voice communication. When any nearby rescuer receives the DSCsignal, 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 orforward 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 isand the type of vessel) in their database while they are in transit to the caller’slocation.