Garmin 2006 Manuale Proprietario

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PPENDIX

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LORAN TD S

YSTEM

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

by the United States Coast Guard. The LORAN (LOng RAnge Navigation) 

system covers the entire United States and the U.S. 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 TD for those who have a collection of LORAN fixes for favorite fishing 

spots and other waypoints recorded as TDs. You can display your position as a 

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

is approximately 30 meters. When the unit is placed in the LORAN TD format 

mode, it simulates the operation of a LORAN receiver. Position coordinates may 

be displayed 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 a waypoint. You must have the correct chain number as well 

as the secondary station identifiers to use this option correctly. These values 

vary for each coordinate set or geographical location. Failure to enter correct 

information could result in inaccuracies for the desired destination. After the 

waypoint is stored in the unit’s memory, it always references the LORAN chain 

number and secondary stations currently selected in the Setup TD field. If you 

enter a different LORAN chain number, change the secondary stations or offsets 

in the Setup TD field, the active waypoint information reflects those changes. 

Because the GPSMAP 3006C/3010C unit 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 Position Format field is located on the Units sub tab on the Main 

Menu—System tab. The Loran TD Setup window contains the fields to select the 

LORAN Chain Number, Primary and Secondary Stations, and TD Offsets.

1.  Using the 

ROCKER, highlight the System tab, press right on the 

ROCKER to highlight the Units sub tab. Highlight the Position Format 

field, and press 

ENTER.

2.  Highlight 

Loran TD, and press ENTER, and then highlight the Setup 

button to the right, and press 

ENTER again.

3.  To change the settings of any of the five fields, highlight the field, press 

ENTER, select the setting you want, and press ENTER again.