S3 User Guide 79 PN 875-0196-000 Rev C1
Appendix C: S3 Screen Description Reference
Serial Number
Serial number of the receiver (it should match the number on
the serial number tag on the back of the S3).
Max Age
Maximum time (in seconds) the GPS receiver can maintain a
differential lock after differential corrections are lost.
Diff Age
Age of the corrections used in the DGPS calculation. For
LOCRTK, optimal operating values are < 5 seconds. Values > 120
seconds require acquiring a new RTK lock. Values > 5 seconds
will cause the radio icon to appear as an “X”. For SBAS, the
DiffAge is typically 6 to 10 seconds.
STDEV
Pseudo-estimate of the DGPS solution accuracy determined as
the RMS value of the positional residual errors. STDEV is valid
only if 6 or more satellites are used in the solution calculation.
Typical values for SBAS correction are 0.5 ft – 1.5 ft (0.15m –
0.45m). Typical values for RTK corrections are < 0.1 ft (3 cm).
Sats Tracked
Number of satellites currently visible in the sky (this is only GPS
satellites and does not include the correction satellites).
Sats Used
Number of satellites used to calculate the position.
HDOP
(Horizontal Dilution Of Precision) The influence of the current
GPS satellite constellation geometry on the horizontal accuracy
of the position solution. Lower HDOP values indicate better
geometry. Typical valves are 0.8 – 2.0.
BER
Relative strength of the correction satellites. In the case of
WAAS, two numbers are shown separated by a hyphen. The
number can be from 0 to 500, with 0 being the best and 500
being the worst.
Table C-9: GPS Details screen button and field descriptions (continued)
Button/Field Description
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