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PPENDIX

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L

ORAN

 TD S

YSTEM

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. 

Change to Loran TD from the Units 

tab on the Main Menu.

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 show 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 can show 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 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 292/298 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.