1. Choosing the right receiver
GPS
Choosing the right receiver

2. 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

3. 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

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

5. Models of Interest
Garmin GPS III Plus
And
Garmin eTrex

6. Garmin GPS III Plus

7. Garmin eTrex

8. 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

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

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

11. References: