Passive GPS Tracking

Is Passive GPS Tracking the Only Solution When Cellular Signal is not Available?

Passive GPS tracking occurred sometime before the real-time tracking. Actually, it is a very simple solution which could be explained in a couple of words. So, a GPS receiver collecting data from GPS/GLONASS/ GALILEO and other systems satellites. The passive tracking device is able to record these data and replay on demand of the user. That is it, no rocket…
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