A Appendix A
DOPs Bar Graph
Displays the various Dilution of Precision (DOP) values as explained below. DOPs are not displayed
when SiRF Binary is selected on the GPS page.
l PDOP: displays the Position Dilution of Precision, which is a combination of HDOP, VDOP and
Time Dilution of Precision. It will always be larger than HDOP and VDOP.
l HDOP: displays the Horizontal Dilution of Precision, which is a measure of the calculated
accuracy of the solution. DOP has no units and lower numbers indicate better solution
geometry. In general, the lower the DOP value, the better confidence you have in the position
reading from your GPS receiver.
l VDOP: displays the Vertical Dilution of Precision, which is a measure of the calculated elevation.
Each DOP bar is color coded to indicate the DOP quality as follows:
Green: The DOP is less than three (best).
Yellow: The DOP is greater than three, but less than six.
Orange: The DOP is greater than or equal to six, but less than twenty.
Red: The DOP is greater than or equal to twenty (worst).
l
Signal vs. Satellite Bar Graph: shows all the visible satellites and their corresponding ID
numbers (PRN) ranging from 1 to 32. Also, the PRN for any currently tracked SBAS satellite
(ranging from 122 to 138) is displayed in this graph. Tapping any bar will also display the signal
to noise ratio (SNR) value for that satellite.
The color of each bar indicates the following:
Green: Good satellite signal strength. Satellite is used with an SNR greater than or equal to
thirty dB.
Yellow: Fair satellite signal strength. Satellite is used with an SNR less than thirty dB.
Red: No signal or the signal strength is below the minimum allowable threshold. Satellite is not
used.
GPS tab
Ranger Series Handheld Computer 62
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