Choosing the right receiver

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Presentation transcript:

Choosing the right receiver GPS Choosing the right receiver

What Is GPS??? GPS stands for Global Positioning System Satellite-based navigation system 24 satellites orbit 2x per day 12,000 miles above : 7,000 miles/hr. Originally designed for military

How does GPS work? The Receiver triangulates signals received from the satellites 3 Satellites = 2D position (Longitude and Latitude) >4 Satellites = 3D position (Long. And Lat. + Altitude) Tracking Begins

Where does it work? Low power radio signals Travel by line of sight Clouds / Glass / Plastic = YES Solid Objects (Dense Forest)= NO!!!

Models of Interest Garmin GPS III Plus And Garmin eTrex

Garmin GPS III Plus

Garmin eTrex

Comparison source: http://www.garmin.com GPS III Plus eTrex Memory 1.44 MB N/A Battery Life 36 HR 22 HR Antenna Detachable Internal Weight 9 oz. 5.3 oz. Waterproof Yes Price $300.00 $119.00

Urban Capabilities The GPS III Plus works better in urban areas. Interstate Exit information Food / Lodging / Service Stations

The Best Choice? Garmin GPS III Plus More capabilities: Battery Life Works with the Computer Urban compatible

References: http://www.garmin.com http://www.rei.com