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Global Positioning System (GPS) Limitations
The GPS cannot detect the vehicle's position during the following instances:
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For the first 5 to 10 minutes after reconnecting the battery (This can take as long as 45 minutes).
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When the satellite signals are blocked by tall buildings, mountains, tunnels, large trees, or large trucks.
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When the GPS antenna is blocked by an object placed above it in the vehicle. The GPS antenna requires a clear unobstructed view of the sky.
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When the satellite signals are blocked by the operation of some electronic aftermarket accessories including, but not limited to non-OEM in-dash entertainment units (radio, CD players/changers, and Lo Jack), cell phones placed near navigation system and window tinting above the GPS antenna.
The accuracy of GPS is reduced during these instances:
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Metallic window tinting above the GPS antenna.
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When only two satellite signals can be received (Three satellite signals are required for accurate positioning).
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When the satellite control centers are experiencing problems.
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When driving near high tension power lines.
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When the satellite signals are blocked by the operation of same electronic aftermarket accessories including, but not limited, to non-OEM in-dash entertainment units (radio, CD players/changers, radar detectors, and theft recovery systems), and cell phones placed near the navigation system.
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