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tracking satellite number 28. The satellite's elevation is 25 degrees above
the horizon and it's location is 44 degrees. It's SNR is 44, which is good.
The FIX numbers in the lower left corner of the screen show the quality of
fix. If the FIX is 9, then it's the best you can get. A FIX of 1 is the worst. The
DOPS display beneath the fix quality show you the "Dilution of Precision"
for the horizontal (HDOP), geometric (GDOP), position (PDOP), time
(TDOP), and vertical (VDOP). The GDOP is a combination of HDOP , VDOP ,
and TDOP . The smaller the DOP's value, the better. The receiver selects
satellites based on the GDOP value, therefore, it always tries to use sat-
ellites that have good DOP values. These depend on the azimuth and
elevation of the satellite, and any ground based obstructions.
Dual Mapping
The windows feature gives you the capability
to have more than one map on the display at
one time. For example, group "M" shown at right
has two half-screen maps, side-by-side. Both
of these maps are completely independent of
each other. In other words, you can zoom in or
out, set options, and other functions on one
map, without affecting the other.
When you press the MENU, ZOOM IN or OUT,
or ENT keys, a message appears asking you
which display you want to affect. On the screen
shown at right, the menu key was pressed. The
unit wants to know which map you want to
change. Press the left arrow key for the left map,
the right arrow key for the right map. The main
menu then appears.
CLOCK
Whenever a clock is showing on a display, new
items appear in the list when you press the
MENU key. These items let you set the clock's
time, set alarms, and change the unit of mea-
sure. The clock and timers can be used on win-
dows, mapping, or the navigation mode.
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