What is a SAT NAV?What comes with the Sat Nav?

What is a SAT NAV?What comes with the Sat Nav?

What is a SAT NAV?
 
Satellite Navigation or sat nav system is a system of satellites that provides gps positioning with global coverage. They are not found in every vehicle and usually are an option available to have when purchasing a vehicle from a  motor dearlership.
 
What comes with the Sat Nav?
 
All sat nav from stock are complete to suit a vehicle which hasn't got one already. 

If the system is incomplete, it will be noted in the pinnacle comments. A complete unit consist of the display unit itself along with the gps aerial, wiring harness, steering wheel (if req), stacker (if req) and sometimes with the facial surround but this will vary from vehicles.