Super-Low Price on Garmin nuvi 660 Widescreen Bluetooth Portable GPS Navigator

         I found a promotion from Amzon.com and surprise of price on, because they discount from list price: $699.99, price: $339.99, you save $360, approximately 51%. I thought this model is one of great Garmin nuvi 660 widescreen portable GPS navigator. Let we see a feature and product details.
Feature
         Widescreen 
         The widescreen format gives [...]

What is GPS?

GPS is Global Positioning System, a satellite-based navigation system made up of a network of 24 satellites placed into orbit by the U.S. Department of Defense (DOD). A technology that allows you to determine your exact location which are longitude, latitude and elevation. The signals from three or more satellites are processed by your GPS [...]