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Main Menu Page
Setup Page
To setup Loran TD from the Main Menu:
1. When ‘Loran TD’ is chosen, the Loran TD setup
window will automatically appear.
2. To change the settings of any of the five fields,
highlight the field, press the CLICK STICK IN.
3. When done, highlight ‘Save’ and press IN.
4. To return to the setup page, simply select Loran TD
from the Position Format field again..
If the active GRI Chain, secondary stations or offsets
have been changed since the waypoint was created,
the waypoint will now reference the active GRI-chain
and secondary stations and adjust the TD coordinates
accordingly. Remember that the GPS is not relying on the
LORAN signal for navigation and actually converts the TD
coordinate to a useful LAT/LON coordinate (in the back-
ground) before storing the waypoint to memory or using
it for navigation. Because of this the unit can navigate to a
TD coordinate anywhere in the world.
For more information on Loran TDs, you may down-
load GARMIN’s “Loran TD Position Format Handbook”
from the GARMIN web site at http://www.garmin.com/
support/userManual.html.
Map Datum - Offers a selection of nearly all map
datums in common use. Every map is based on a map
datum (a reference model of the earth’s shape) and is
usually listed in the title block of the map. If you are
comparing GPS coordinates to a paper map, chart, or
other reference, the map datum in this fi eld must match
the horizontal map datum used to generate the map or
other reference. The default datum is WGS 84 (World
Geodetic Survey 1984) and should only be changed when
using maps or charts specifying a different datum. If a
map does specify a datum, use the options list to fi nd
datums applicable to the region of the map, selecting the
one that provides the best positioning at a known point.
If necessary, you also may choose the ‘User’ datum for
custom designed grids.
Distance/Speed - You can choose from three units of
measure to display your rate of travel.
Elevation/Vertical Speed - You can choose from
two units of measure to record your elevation and vertical
speed.
Setting Loran TD Info
Map Datum
Options Menu
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