The
can be programmed to provide position
that meet specific
accuracy levels. This programming is discussed in more detail in the Satel-
lite- SF (Special Function) section that follows.
The Estimated Position entry is also displayed for your convenience, so
you may confirm that the entry is correct for your location. If you should
trailer your boat for long distances, the Estimated Position may need to be
updated in order for the GPS to find your new position quickly.
menu
appear along the right edge of the Satellite Status
screen. The
has already been identified as the key to press to
update the Estimated Position, Antenna Height or UTC Date Time.
(Special Functions) calls up the
-SF
display which
permits you to change some of the conditions involving satellite acquisi-
tion, tracking, and position calculations.
Satellite SF (Special Functions)
The
FIX
TYPE
selection permits the operator to choose between 2-D
(dimensional)
data which uses three satellites and the user entered
antenna height to calculate
AUTO mode.
AUTO
mode normally provides 3-D
when
four satellites are
2-D
when only
three satellites are in view. It is believed that while
SA is active, 2-D fixing mayprovide
slightly
more
accurate positioning since SA induced errors in
the antenna height calculations would not be
used.
SEARCHTHESKY
TO
HDOP LEVEL
Press
to toggle between
2D or
AUTO
selection
SF menu.
SEARCHTHESKY
POSITION
PRESS MENU TO RETURN
As we mentioned earlier, when power is applied to the
100 for the
veryfirst time,theGPS sensormusttindandidentifythree
satellites
before it will calculate and provide position data. It will enter a “satellite
if the geographic position and UTC time are not known.
OPERATION 102
