Jabra c330 User Manual

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PPENDIX

The Global Positioning System (GPS) is a satellite-based navigation 

system made up of a network of 24 satellites placed into orbit by the 

U.S. Department of Defense. GPS was originally intended for military 

applications, but the government made the system available for civilian 

use in the 1980s. 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 GPS 

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). Once your 

position has been determined, the receiver can display it on the c330’s 

 page and calculate other information, such as speed and bearing.

The Wide Area Augmentation System (WAAS) is an FAA-funded project 

to improve the overall integrity of the GPS signal and increase position 

accuracy for users in North America. The system is made up of satellites 

and approximately 25 ground reference stations positioned across the 

United States that monitor GPS satellite data. Two master stations, 

located on either coast, collect data from the reference stations and create 

a GPS data correction message. 
According to the FAA’s Web site, testing in September 2002 of WAAS 

confirmed an accuracy performance of 1–2 meters horizontal and 2–3 

meters vertical throughout the majority of the continental United States 

and portions of Alaska. For more information, go to 

http://gps.faa 

. 

WAAS is just one service provider that adheres to the MOPS 

(Minimum Operational Performance Standard) for global Satellite 

Based Augmentation Systems (SBAS). Eventually, there will be several 

services of worldwide geostationary communication satellites and ground 

reference stations. 
Currently, enabling WAAS on your c330 in regions that are not supported 

can degrade the accuracy. For this reason, when you enable WAAS on 

your c330, the receiver automatically uses the method that achieves the 

best accuracy. To enable WAAS, refer to