Jamar RAC Geo II, Руководство пользователя

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RAC Geo II User’s Manual
4-2
GPS sensor or external sensor...
which is right for you?
The RAC Geo II contains an internal GPS receiver that allows it to do
distance measuring without the need of an external distance sensor like a
modular or magnetic sensor. The benefit of using the internal sensor is that
it means you do not have to install any wiring in the vehicle or get under
the hood. You also do not have to calibrate the instrument.
The trade off for this benefit, however, is a reduction in overall accuracy.
The error rate of using the internal GPS sensor is approximately 1 foot per
1000 feet, while the error rate of a properly installed modular or magnetic
sensor is approximately 1 foot per mile (5280 feet).
Note that if you choose to use an external distance sensor for your distance
measuring, you can still use the internal GPS receiver for all other GPS
functions, such as viewing coordinates or storing GPS data to memory.