GPS Position Locking is simply how long it takes for the GPS unit to automatically calculate its location after it is powered up.

You will notice this when you are reviewing the GPS recorded data with the software.  Sometimes the track will not start from the same location it stopped.  You will see small gaps in the data.  The gaps are caused because of the time it takes for GPS Position Locking.

The more metal you have around or above the unit, the longer it will take for Position Locking. GPS signals, which are very weak by the time they reach the  earth, are blocked if the antenna is placed directly under metal objects.

To reduce  GPS Position Locking it is recommended that the unit be left on at all times.

Below is a listing of placements for the 3100_INT Model.

On the Front or Rear Dash Board                            99%

Under the Front or Rear Dash Board coverings         95%

In the Glove Box                                                   80% - 95%

In the trunk *                                                         0%

Under the car *                                                      0%

* If you need to place the unit in the trunk or under the car, you need to use the 3100-EXT, External Antenna Model, for data logging or the Rover RT-1500,vehicle powered, or Protrak Ranger, battery powered covert sustem, for real-time tracking.

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