SATNAV is a well-known acronym that refers to a GPS navigation device, and people often use it interchangeably with the term GPS. However, SATNAV is just one of many synonyms that describe GPS devices and their functions. Other common synonyms include GPS navigator, GPS unit, GPS receiver, GPS system, navigation system, car navigation device, and satellite navigation system. Some companies have even created unique terms to describe their GPS products, such as TomTom's "GO" and Garmin's "Nuvi". Ultimately, these synonyms all refer to the same thing - a device that uses satellite signals to determine a user's location and provide directions to a desired destination.