LORAN TD SetupLORAN C is a radio navigation aid operated andmaintained in the United States by the United StatesCoast Guard. The name LORAN is an acronym for“LOng RAnge Navigation.” The LORAN systemcovers the entire United States and the United StatesCoastal Confluence Zone. From the perspective ofa mariner, the system is used for ocean and coastalnavigation. It can be used as a supplemental systemfor harbor and harbor approach navigation, and it isused for inland navigation by recreational vehicles.LORAN TD FeatureThe LORAN TD (Time Delay) feature eases the tran-sition from using LORAN to using GPS. The unit au-tomatically converts GPS coordinates to LORAN TDsfor those who have a collection of LORAN fixes forfavorite fishing spots and other waypoints recorded asTDs. You can display your position as a TD or enterwaypoints as TDs. The accuracy to be expected fromthis conversion is approximately thirty (30) meters.When the unit is placed in the LORAN TD formatmode, it simulates the operation of a LORAN receiv-er. You can display position coordinates as TDs anduse all navigation functions as if the unit was actuallyreceiving LORAN signals.Using the LORAN TD FormatWhen creating new waypoints using LORAN TDcoordinates, you must set the correct LORAN chainnumber and secondary stations in the Chain Numberfield before storing the waypoint. After the waypointis stored in unit memory, it will always reference theLORAN chain number and secondary stations cur-rently selected. If you enter a different LORAN chainnumber or change the secondary stations or offsets,the active waypoint information will reflect thosechanges. Since the 76CS Plus does not rely on theLORAN signal for navigation, it can reference a dif-ferent GRI chain and/or secondary stations and stillnavigate to the location stored in memory.Open the Location Setup page and select Loran TDfor the Position Format. You must know your GRIchain number and secondary stations to create a LO-RAN TD position.76CS Plus Owner’s Manual 97APPENDIX > LORAN TD SETUP190-00507-00_0A.indd 97 2/14/2005 3:33:58 PM
