Garmin 496 Manuale Proprietario

LORAN C is a radio navigation aid operated and maintained in the 

United States by the United States Coast Guard. The name LORAN 

is an acronym for “LOng RAnge Navigation.” The LORAN 

system covers the entire United States and the United States 

Coastal Confluence Zone. From the perspective of a mariner, the 

system is used for ocean and coastal navigation. It can be used as a 

supplemental system for harbor and harbor approach navigation, and 

it is used for inland navigation by recreational vehicles. 

The LORAN TD (Time Delay) feature eases the transition from 

using LORAN to using GPS. The GPSMAP 496 unit automatically 

converts GPS coordinates to LORAN TDs for those who have a 

collection of LORAN fixes for favorite fishing spots and other 

waypoints recorded as TDs. You can show your location as a TD 

or enter waypoints as TDs. The accuracy to be expected from this 

conversion is approximately thirty (30) meters. When the unit is 

placed in the LORAN TD format mode, it simulates the operation 

of a LORAN receiver. Location coordinates can be showed as TDs, 

and all navigation functions can be used as if the unit was actually 

receiving LORAN signals.

When creating new waypoints using LORAN TD coordinates, 

you must set the correct LORAN chain number and secondary 

stations in the Setup TD field before storing the waypoint. After the 

waypoint is stored in unit memory, it always reference the LORAN 

chain number and secondary stations currently selected in the 

Setup TD field. If you enter a different LORAN chain number, or 

change the secondary stations or offsets in the Setup TD field, the 

active waypoint information does reflect those changes. Since the 

GPSMAP 496 does not rely on the LORAN signal for navigation, 

it can reference a different GRI chain and/or secondary stations and 

still navigate to the location stored in memory.
The LORAN Location Format field is located under the Units sub 

tab in the Main Menu. The LORAN TD Setup window contains 

the fields to select the Loran GRI-Chain Number, Primary and 

Secondary Stations, and TD Offsets.

GPSMAP 496 Owner’s Manual 

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