LORAN TD Feature
The LORAN TD feature eases the transition from using LORAN to using GPS. The
GPSMAP 235 Sounder 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 way-
points as TDs. The accuracy to be expected from this conversion is approximately
thirty meters. When the sounder is placed in the LORAN TD format mode, the-
sounder
simulates
the full operation of a LORAN receiver. Position coordinate
may be displayed as TDs, and all navigation functions may be used
as if
the unit
were actually receiving LORAN signals.
Selecting and Setting Up the LORAN TD Format
The LORAN Position Format field is located in the Navigation Setup Menu. To
access the list of available Position Formats highlight the Position Format field and
press ENTER. Scroll through the list of formats until 'LORAN TD' is highlighted,
then press ENTER to accept and activate the 'LORAN TD' position format. After
the 'LORAN TD' format is selected, a new field will appear to the right of the
Position Format. This field, called 'Setup TD' provides access to the 'LORAN
Setup' page. The 'LORAN Setup' page contains the fields where the GRI-Chain
Number and Secondary Stations are selected. To activate the 'LORAN SETUP'
page, highlight the 'Setup TD' field and press ENTER.
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SECTION
12
LORAN TDs
Using the LORAN TD
Position Display Format
A.
Position coordinates may be displayed as LORAN
TDs, and all navigation functions may be used as
if the unit were actually receiving LORAN sig-
nals.
B.
Scroll through the list of formats until ‘LORAN
TD’ is highlighted, then press ENTER to accept
and activate the ‘LORAN TD’ position format.
A
B
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