Ag Leader GPS 4100 Operators Manual - Manual (Page 17)

GPS 4100 General Instructions
Ag Leader Technology
March 2001 15
UTC TIME: Greenwich Mean Time (GMT), the current time in
Greenwich, England
NOTE: The US Coast Guard may also refer to GMT as "ZULU".
Latitude: Current latitude of the receiver in degrees-minutes.
fractional minutes.
Longitude: Current longitude of the receiver in degree-
minutes.fraction minutes.
Elevation: Current elevation of the receiver in feet.
GPS Speed: Current speed of the receiver in miles-per-hour.
Number of Satellites: Indicates the number of satellites the unit
is using. The unit can track a maximum of twelve satellites.
Differential Status: Indicates ON or OFF, telling you whether a
differential signal is being used.
Beacon/Satellite Frequency: Indicates the frequency of the
differential source that the GPS is using for the location of the
differential source.
Differential SNR: Signal-to-noise-ratio (SNR) indicates the
strength of the correction signal in relation to the amount of
background noise that can interfere with signal reception. A good
SNR is 10 to 18.
HDOP/PDOP: Horizontal Dilution of Precision (HDOP)
indicates the quality of the horizontal GPS position. Position
Dilution of Precision (PDOP) is a unitless measure indicating
when the satellite geometry can provide the most accurate results.
When satellites are spread around the sky, the PDOP value is low
and the computed position is more accurate. When satellites are
grouped close together the PDOP is high and the positions are
less accurate.