Navman SmartST Professional User Manual download pdf (Page 7)

Navman SmartS™ Professional for Palm OS

What is GPS?

The Global Positioning System (GPS) is a network of satellites launched by the US military in the 1970s. The satellites

continuously transmit accurate time and position information, which is freely used by commercial and military applications

worldwide. GPS receivers are designed to pick up the high frequency radio signals from these satellites, and use the

information to determine your exact location. Today, there are many applications that use GPS, from marine to automotive,

aviation and military.

There are 24 satellites in total, orbiting approximately 12,000 miles above the earth. While a GPS receiver can detect

signals from up to 12 satellites at any one time, only three are needed to provide the two-dimensional position or “ﬁ x”

(latitude and longitude) that is required for vehicle navigation systems. A three dimensional ﬁ x requires four satellites and

provides improved positional accuracy.

SmartS Professional is designed speciﬁ cally to use GPS information to ﬁ nd your current position, and to calculate the

best route to your desired destination using the road maps stored on your memory card. SmartS Professional will then

guide you with voice and visual commands to your destination using the continuous stream of GPS data to track your

position as you make a trip.

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Navman SmartST Professional User Manual Page 7