Garmin GPSMAP 376C Owner's Manual

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LORAN TD SetupLORAN C is a radio navigation aid operated and maintained in theUnited States by the United States Coast Guard. The name LORANis an acronym for “LOng RAnge Navigation.” The LORANsystem covers the entire United States and the United StatesCoastal Confluence Zone. From the perspective of a mariner, thesystem is used for ocean and coastal navigation. It can be used as asupplemental system for harbor and harbor approach navigation, andit is used for inland navigation by recreational vehicles.LORAN TD FeatureThe LORAN TD (Time Delay) feature eases the transition fromusing LORAN to using GPS. The GPSMAP unit automaticallyconverts GPS coordinates to LORAN TDs for those who have acollection of LORAN fixes for favorite fishing spots and otherwaypoints recorded as TDs. You can show your location as a TDor enter waypoints as TDs. The accuracy to be expected from thisconversion is approximately thirty (30) meters. When the unit isplaced in the LORAN TD format mode, it simulates the operationof a LORAN receiver. Position coordinates might be shown as TDs,and all navigation functions can be used as if the unit was actuallyreceiving LORAN signals.Using the LORAN TD FormatWhen creating new waypoints using LORAN TD coordinates, youmust set the correct LORAN chain number and secondary stations inthe Setup TD field before storing the waypoint. After the waypointis stored in unit memory, it always reference the LORAN chainnumber and secondary stations currently selected in the Setup TDfield. If you enter a different LORAN chain number or changethe secondary stations or offsets in the Setup TD field, the activewaypoint information will reflect those changes. Since the GPSMAP376C does not rely on the LORAN signal for navigation, it canreference a different GRI chain and/or secondary stations and stillnavigate to the location stored in memory.The LORAN Location Format field is located on the SystemTab—Location sub tab on the Main Menu. The LORAN TD Setupwindow contains the fields to select the Loran GRI-Chain Number,Primary and Secondary Stations, and TD Offsets.124 GPSMAP 376C Owner’s ManualAPPENDIX > LORAN TD SETUP190-00508-00_0C.indd 124 11/6/2006 9:47:48 AM