Does a modern GPS satnav require a mobile/cell phone to work?

Question

Thinking of buying a Satnav for my car, do modern GPS systems require a mobile phone connection in order to function?

Specifically this one: http://cgi.ebay.co.uk/MAGELLAN-ROADMATE-1200-GPS-SAT-NAV-SYSTEM-not-a-tomtom_W0QQitemZ360082918257QQcmdZViewItem?hash=item360082918257&_trkparms=39%3A1%7C66%3A2%7C65%3A3%7C240%3A1308&_trksid=p3286.c0.m14

Thanks

Answer 1

No, they don't, they link up to the satellites, they don't use cell phones in any way, never have.

Answer 2

No, they don't require mobile phones to work. GPS's link directly to satellites in space, and use a completely different system compared to cellular signals.