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    Hello, Sam! We have a proper solution for your problem, we are really good at blocking GPS-based trackers. Your Spireon VP2500 is a rather simple auto tracker, which obtains its coordinates from GPS and then simply sends them to a server, using CDMA or GPRS technology. And upgrade called Vehicle Path is a simple user interface. Also that device is rather small and can be installed transparently. And that’s the main reason why many employers spy on their employees with help of such devices. Basically it uses GPS frequencies (L1: 1575.42; L2: 1227.60; L5: 1176.45 MHz) for navigation a simple GPS jamming device will be able to block its ability to track you. But such a device may not be so helpful under some circumstances. You should know that Spireon VP2500 can be upgraded with a wide variety of sensors, such as accelerometers, fuel sensors and many others. In that case if you will use a simple GPS signal blocker – the data from those sensors will be still transmitted to the servers. So, if you are definitely sure that you particular tracker uses CDMA technology you will be forced to block CDMA (450/850 MHz) frequencies together with GPS jamming. In that case no data will be transmitted and your location will remain hidden, until you turn that combined jamming device off. And and as for a supervisor, it will look like you’ve simple left CDMA coverage area and the connection was lost. We also have to warn you that if your mobile phone is using CDMA, it will be unfortunately disabled too. Thanks for your question, I hope I’ve managed to help!

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