Garmin GPS 152 Owner's Manual And Reference Manual

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Garmin GPS 152 Owner's Manual And Reference Manual Manual pdf 80 page image

70Appendix ALoran TDLoran TD SystemLORAN C is a radio navigation aid operated and maintained in the United States by the UnitedStates Coast Guard. The name LORAN is an acronym for “LOng RAnge Navigation.” The LORANsystem covers the entire United States and the U.S. Coastal Confl uence Zone. From the perspectiveof a mariner, the system is used for ocean and coastal navigation. It can be used as a supplementalsystem for harbor and harbor approach navigation, and it is used for inland navigation by recreationalvehicles.LORAN TD FeatureThe LORAN TD (Time Delay) feature eases the transition from using LORAN to using GPS. TheGPS unit automatically converts GPS coordinates to LORAN TDs for those who have a collection ofLORAN 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 isapproximately 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 navigationfunctions 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 LORANchain number and secondary stations in the Setup TD field before storing the waypoint. After thewaypoint is stored in unit memory, it will always reference the LORAN chain number and secondarystations currently selected in the Setup TD field. If you enter a different LORAN chain number, changethe secondary stations or offsets in the Setup TD field, the active waypoint information will refl ect thosechanges. Since the GPS unit does not rely on the LORAN signal for navigation, it can reference adifferent GRI chain 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.You may change to Loran TD from either theMap Page or Units Tab on the Main Menu.