Garmin 276c 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 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 display 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. Position coordinates might be shown as TDs, 

and all navigation functions may 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 will 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 will reflect those changes. Because the 

GPSMAP 276C does not rely on the LORAN signal for navigation, 

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

navigate to the location stored in memory.
The LORAN Location Format field is located on the System 

Tab—Location sub tab on 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.

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LORAN TD S

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