There's such a thing as metonymy, where a word might represent something larger than the specific thing referred to. In common English, people use 'GPS' to refer to the capability of being able to use a human computer interface such as a busybox-backed touchscreen to navigate with the assistance of satellite based location services.
Used in a sentence, "Hey does the rental car come with GPS?" "Of course, it's not 2008 anymore"
