8 PowerBox-Systems − World Leaders in RC Power Supply Systems
b) Speedx
Double ashing of the LED – The unit has located sufcient 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 x
LED glows continuously – The unit has located sufcient satellites to guarantee
reliable speed and position detection. Positional accuracy is less than 5 m.
d) No x, no system detected
Rapid ashing of the LED means that no Bus system has been detected within ve
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 uctuations, 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.
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