52
Pr
eliminary
Units Page
The Units features are best used by individuals with
a working knowledge of map grids and datums. To learn
more about these subjects, visit the National Imagery and
Mapping Agency at http://www.nima.mil or inquire at
your local library.
To select Units Page options:
1. For all fi elds on this page, highlight the fi eld and
then press the
CLICK STICK
to display the Options
Menu for the fi eld.
2. Highlight the desired option on the menu and then
press the
CLICK STICK
to place it in the fi eld.
Position Format -
Allows you to choose from
different grid formats. The default position format,
‘hddd°mm.mmm’ displays the latitude and longitude in
degrees and minutes and is most commonly used.The
following additional formats are available:
hddd.ddddd°— latitude/longitude in decimal degrees
only, hddd°mm’ss.s”— latitude/longitude in degrees,
minutes, seconds, UTM/UPS— Universal Transverse
Mercator / Universal Polar Stereographic grids, British
Grid, Dutch Grid, Finnish KKJ27, German Grid, India
Zones, Irish Grid, Loran TD, Maidenhead, MGRS, New
Zealand, Qatar Grid, RT90, Swedish Grid, Swiss Grid,
Taiwan Grid, User Grid, W Malayan RSO
Using the LORAN TD Format
When creating new waypoints using LORAN TD
coordinates, you must set the correct LORAN chain num-
ber and secondary stations in the Setup TD fi eld before
storing the waypoint. After the waypoint is stored in unit
memory, it will always reference the LORAN chain num-
ber and secondary stations currently selected in the Setup
TD fi eld. If you enter a different LORAN chain number,
change the secondary stations or offsets in the Setup TD
fi eld, the active waypoint information will refl ect those
changes. Since the GPSMAP unit 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.
Units Page
Position Format
Options Menu
Main Menu Page
Setup Page
The ‘User’ datum is based on
a WGS-84-Local datum and
is an advanced feature for
unlisted or custom datums. To
learn more, check your local
library or on the world wide
web for educational materials
on datums and coordinate
systems.
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