Garmin 190-00556-10 ユーザーズマニュアル

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NDERSTANDING

 GPS > 

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HE

 GPS I

NFORMATION

 P

AGE

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.
GPS satellites circle the earth twice a day in a very precise orbit 

and transmit signal information to Earth. The GPS receiver in your 

Quest takes this information and uses triangulation to calculate 

your exact location. Essentially, the GPS receiver compares the 

time a signal was transmitted by a satellite with the time it was 

received. The time difference tells the GPS receiver how far away 

the satellite is. With distance measurements from a few more 

satellites, the receiver can determine your location and display it on 

the Quest’s Map page.
A GPS receiver must be locked on to at least three satellites 

to calculate a 2D location (latitude and longitude) and track 

movement. With four or more satellites in view, the receiver can 

determine your 3D location (latitude, longitude, and altitude).

After your location has been determined, the GPS unit can 

calculate other information, such as speed, bearing, track, trip 

distance, distance to destination, sunrise and sunset, and time.
WAAS is a system of satellites and ground stations that provide 

GPS signal corrections, giving you even better position accuracy. 

WAAS corrects for GPS signal errors caused by ionospheric 

disturbances, timing, and satellite orbit errors, and it provides vital 

integrity information regarding the health of each GPS satellite.

The GPS Information page provides a visual reference of GPS 

receiver functions, including current satellite coverage, receiver 

status, and position accuracy. To access this page, press MENU, 

highlight Settings, and press OK. From the Settings page, 

highlight GPS Info and press OK. 
GPS satellites are positioned throughout the sky. As soon as you 

turn on your Quest, it attempts to acquire satellite signals. The sky 

view area on the GPS Information page displays which satellites 

are currently in your area.