Title says it all. I was speaking to one of my co-workers and she said she had a GPS system in her car made by Panasonic I believe which required her to pay a monthly subscription. Ive checked this site and have also done a few google searches and see nothing about paying for anything. My understanding was you buy the receiver and software and then mount and install and your good to go. She also told me in order to get access to re-routing it would cost an extra $200 a month. Can anybody help me out with this info?

Thanks in advance.

GPS is just a signal like AM/FM. It's broadcasted out and your receiver grabs it and does what it wants with it. You pay for a software that takes that information and compares it to a map and visually shows you where you are. When people pay subscription, it's usually for something else, like real-time traffic or weather or any other extra information that needs to be constantly generated.

When people pay subscription, it's usually for something else, like real-time traffic or weather or any other extra information that needs to be constantly generated.

There is no fee for using gps service but apparently some people have been scammed by certain companies into believing there is.
The satellites are owned by the government however it is EXTREMELY unlikely that they would ever switch the system off for any reason.

The system works by measuring signal decay and there is no way that they can tell who is using it since no signal is sent out to the satellite. Unless they have a secondary system which uses signals not recognized by standard gps recievers they cant shut it off without losing use of it themselves.

The GPS includes a feature called Selective Availability (SA) that introduces intentional errors between 0 meters and up to a hundred meters (300 ft) into the publicly available navigation signals, making it difficult to use for guiding long range missiles to precise targets. Additional accuracy was available in the signal, but in an encrypted form that was only available to the United States military, its allies and a few others, mostly government users.

SA typically added signal errors of up to about 10 meters (30 ft) horizontally and 30 meters (100 ft) vertically. The inaccuracy of the civilian signal was deliberately encoded so as not to change very quickly, for instance the entire eastern U.S. area might read 30 m off, but 30 m off everywhere and in the same direction. In order to improve the usefulness of GPS for civilian navigation, Differential GPS was used by many civilian GPS receivers to greatly improve accuracy.

The US military has developed the ability to locally deny GPS (and other navigation services) to hostile forces in a specific area of crisis without affecting the rest of the world or its own military systems.

Since anyone with the capability to launch guided missiles can no doubt easily obtain a fully accurate military unit from the same guy they bought the missiles from LOL!

After doing a little research I see that you are correct Toaster.