Garmin GPSMAP 235 Sounder - Manual (Page 98)

It is important to set the correct GRI-chain and secondary stations for the way-
point that you want to create. The GRI-chain and Secondary station fields cannot
be edited on the Create Waypoint page. The first setting on the LORAN Setup
page is the LORAN Chain Number (GRI chain). Accessing this field activates a
dropdown menu containing the 28 available chain numbers. Highlight the
desired GRI-chain number, then press ENTER to accept your selection.
The next settings are the secondary stations. Accessing these fields also involves
activating a dropdown menu containing the 5 secondary station identifiers. To
select a station, highlight the desired setting, then press ENTER to accept your
selection. if a secondary station is selected, but the identifier is not valid for the
active GRI-chain, the corresponding field on the Position Page will be filled with
zeros. To remedy this, select a valid secondary station identifier.
When the 'LORAN TD' position format is active, any waypoint stored in the unit's
memory will ALWAYS reference the GRI Chain and secondary stations that are
currently selected on the 'LORAN SETUP' page. This can become confusing when
reviewing waypoints that have already been saved in the unit's memory.
If the active GRI Chain, and secondary stations have been changed since the way-
point was created, the waypoint will now reference the active GRI-chain and sec-
ondary stations and the TD coordinates will be adjusted accordingly. Remember
that the GPS is not relying on the LORAN signal for navigation and actually con-
verts the TD coordinate to a useful LAT/LON coordinate (in the background)
before storing the waypoint in unit memory or using it for navigation. Because of
this the unit can navigate to a TD coordinate anywhere in the world.
88
SECTION
12
LORAN TDs
Using the LORAN TD
Position Display Format
A. It is important to set the correct GRI Chain and
secondary stations for the waypoint that you
want to create. The GRI Chain and secondary
station fields cannot be deleted on the Create
Waypoints Page.
B. To select a station, highlight the desired setting,
then press ENTER to accept your selection.
A B
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