Garmin GPSMAP 276C Owner's Manual

Also see for GPSMAP 276C: Owner's manual Owner's manual Quick reference guide Declaration of conformity Owner's manual

Contents

101AppendixLORAN TD Setup‘Location’ tab of the Setup TabLORAN TD SetupLORAN TD SystemLORAN C is a radio navigation aid operated and maintained in the United States by the United StatesCoast Guard. The name LORAN is an acronym for “LOng RAnge Navigation”. The LORAN system coversthe entire United States and the U.S. Coastal Confluence Zone. From the perspective of a mariner, thesystem is used for ocean and coastal navigation. It can be used as a supplemental system for harbor andharbor approach navigation, and it is used for inland navigation by recreational vehicles.LORAN TD FeatureThe LORAN TD (Time Delay) feature eases the transition from using LORAN to using GPS. TheGPSMAP unit automatically converts GPS coordinates to LORAN TDs for those who have a collectionof LORAN fixes for favorite fishing spots and other waypoints recorded as TDs. You can display yourposition as a TD or enter waypoints as TDs. The accuracy to be expected from this conversion is ap-proximately thirty (30) meters. When the unit is placed in the LORAN TD format mode, it simulates theoperation of a LORAN receiver. Position coordinates may be displayed as TDs, and all navigation func-tions may be used as if the unit was actually receiving LORAN signals.Using the LORAN TD FormatWhen creating new waypoints using LORAN TD coordinates, you must set the correct LORAN chainnumber and secondary stations in the Setup TD field before storing the waypoint. After the waypoint isstored in unit memory, it will always reference the LORAN chain number and secondary stations cur-rently selected in the Setup TD field. If you enter a different LORAN chain number, change the secondarystations or offsets in the Setup TD field, the active waypoint information will reflect those changes. Sincethe GPSMAP 276C does not rely on the LORAN signal for navigation, it can reference a different GRIchain and/or secondary stations and still navigate to the location stored in memory.The LORAN Position Format field is located under the ‘Units’ tab in the Main Menu. The ‘LORANTD Setup’ window contains the fields to select the Loran GRI-Chain Number, Primary and SecondaryStations, and TD Offsets.