English
14
Setting Up GPS Positioning
The
GPS Settings
tool is used to set the environmental condi-
tions in which the unit is to be used. These settings have an
impact on both the availability and accuracy of the position
computed by the unit.
Tap
, then select
Programs>GPS Utilities>GPS Settings
to run
the GPS Settings utility. The following parameters are dis-
played (see screen opposite):
•
Open Sky
: Check this option if you are working in an open
sky area.
•
Tree Canopy
: Check this option if you are working in a for-
ested area.
•
Urban Canyon
: Check this option if you are working in an
urban area with high buildings in the vicinity.
•
Custom
: Check this option if you want to set each of the
GPS parameters individually. Do not use this option unless
you are very familiar with these parameters. When check-
ing this option, a new dialog box opens (see opposite) in
which you can set the following parameters:
-
DOP type
: Choose the DOP type on which to set an
upper limit (see next field).
The position of GPS satellites in orbit determine the
DOP values for a given site. The higher the DOP value,
the less accurate the position solution. PDOP (Position
Dilution of Precision) is the DOP value for the three-
dimensional position solution. HDOP (Horizontal Dilu-
tion of Precision) is the DOP value for the two-dimen-
sional horizontal position.
-
Maximum DOP
[PDOP or HDOP]: DOP values consid-
ered “good” are less than 3. Values greater than 5 are
considered poor. Thus, small DOP is associated with
widely separated satellites. No position will be com-
puted when the selected DOP type exceeds the
entered
Maximum DOP
.
Summary of Contents for MobileMapper CX - Hiking GPS Receiver
Page 1: ...MobileMapper CX Getting Started Guide...
Page 8: ...English...
