Satellite navigation

A satellite navigation system or satnav system is a system of satellites that provide autonomous geo-spatial positioning with global coverage.

It allows small electronic receivers to determine their location (longitude, latitude, and altitude) to high precision (within a few metres) using time signals transmitted along a line of sight by radio from satellites.The signals also allow the electronic receivers to calculate the current local time to high precision, which allows time synchronisation.A satellite navigation system with global coverage may be termed a Global Navigation Satellite System (GNSS).


Displayed here is a TomTom Go 610 Global Positioning System (GPS) navigation device. TomTom NV is a Dutch company, founded in 1991, that produces navigation and mapping products.The TomTom Go product is an all-in-one GPS navigation device with a touch screen, speaker, USB port, and internal lithium ion battery.Most models have Bluetooth transceivers that allow connection to a smartphone which allows it to make and receive calls.