Garmin 176 Manuale Proprietario

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PPENDIX

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ORAN

 TD

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 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 TDs 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 thirty 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 the waypoint. After the waypoint 

is stored in unit 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 or change 

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

waypoint information reflects those changes. Since the GPSMAP 

176/176C 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.