Manual Garmin GPSMAP 495 (page 158 of 179) (English)

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150 GPSMAP 495 Owner’s Manual

Appendix > Loran TD Setup

LORAN TD Setup

LORAN 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.

LORAN TD Feature

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

using LORAN to using GPS. The GPSMAP 495 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.

Using the LORAN TD Format

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 495 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.

Hi
Does the Garmin 495 perform a ‘predictive turn’ at waypoints, when slaved to an autopilot? Submitted on 21-11-2022 at 12:22
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Garmin GPSMAP 495 Manual

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