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ROUTE 66 Navigate 7 – User Manual
65
How does GPS work?
The Global Positioning System (GPS) is a satellite-based navigation system made up of a network of 24
satellites placed into Earth’s orbit. GPS works in any weather condition, anywhere in the world, 24 hours a
day. There are no subscription fees or setup charges to use GPS.
A GPS receiver must be locked on to the signal of at least three satellites to calculate a 2D position
(latitude and longitude) and track movement. With four or more satellites in view, the receiver can
determine your 3D position (latitude, longitude and altitude).