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b) Speedfix
Double flashing of the LED – The unit has located sufficient satellites to guarantee
reliable speed detection. Positional accuracy is greater than 5 m, providing the ba-
sis for speed compensation in combination with iGyro units.
c) Positional fix
LED glows continuously – The unit has located sufficient satellites to guarantee
reliable speed and position detection. Positional accuracy is less than 5 m.
d) No fix, no system detected
Rapid flashing of the LED means that no Bus system has been detected within five
seconds of switching on. The
GPS III
switches to Terminal mode, in which various
settings can be altered.
6. INFORMATION ON ACCURACY
There is a widespread belief that GPS cannot measure speed accurately in three-di-
mensional space, but this is not so. The
GPS III
employs the latest generation of
receivers which measure speed by exploiting the Doppler effect, rather than by
comparing the current position with the previous one. This measurement process
is fast and very accurate.
The positional accuracy of a GPS system is subject to the usual fluctuations, and
even the latest receivers have not improved on this aspect of performance. Howe-
ver, the error is generally less than 10 m, and is therewith negligible for modelling
applications.
Summary of Contents for 235-3525
Page 1: ...Instruction Manual GPSIii...