Magellan MobileMapper - GPS Software Spécifications télécharger pdf (Page 22)

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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.

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Magellan MobileMapper - GPS Software Spécifications Page 22