Most Ford vehicles now make it an option to add an installed GPS to its cars and it often comes standard with their luxury vehicles. To get a GPS for your car, you can buy a portable GPS system for as little as a hundred dollars. If you want to have it custom installed into your dash, it may cost many hundreds of dollars.
You learn about ford gps navigation system on the following site: http://www.ford.com/technology/sync/about/. They have a lot of info.
I think what your referring to is a GPS navigation system. These start at around eighty dollars and go up in price from there. They produce maps as you go by using satellite location.
Many Ford models will have both a DVD player and a GPS system as an optional accessory which is available for an additional cost. It is not a guarantee that these will come standard unless it is a luxury card.
Newer Ford models accept GPS cards as ways to navigate using their built in navigation system. A few models that accept this are the new Ford Syncs and Ford Edges.
Garmin's tend to run cheaper than other GPS systems. As far as the navigation, all GPS systems are pretty much the same. The differences come into play with the features.
Ford's gps navigators are powered by TeleNav. The TeleNav site contains details about the functionality provided by their software: http://www.telenav.com/about/pr/pr-20090108.html
Of course, Ford cars can have the GPS system installed. It would be better for you to install a portable navigation system because those can be easily installed and transferred between cars.
There aren't many handheld GPS navigation systems, but you can always find one for you. There is the Garmin GPSMAP 62S Handheld GPS Navigator, Magellan eXplorist GC Waterproof Geocaching GPS, and DeLorme Earthmate PN-60 Portable GPS Navigator. They cost around $130-400.
From portable and in-dash navigation systems to marine, handheld and fitness GPS navigation
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Since Garmin is a very popular GPS navigation system manufacturer, it is simple to find GPS reviews for Garmin products. Garmin puts out a large line of GPS navigation systems, so it is important to find GPS reviews for the specific Garmin GPS navigation system that you are interested in. Reviews often discuss how easy the GPS navigation systems are to use, their capabilities, their prices and how well they last over the years.
Garmin and Tomtom are both reputable brands of GPS navigation system.