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  1. Vehicle has left the road on the map.

  2. Satellite count is extremely low (NSAT). A good satellite count would be 74+ satellites.

  3. HDOP relates to accuracy of the GPS. A good HDOP count would be less than 14.50

  4. GPS satellites are not necessarily directly above a vehicle, with some satellites positioned on the horizon. Trees, buildings and concrete structures can interfere with GPS location and accuracy.

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