Garmin 2006 オーナーマニュアル

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 WAAS/EGNOS?

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

improve the overall integrity of the GPS signal for users in North America. In 

Europe, WAAS is referred to as EGNOS.
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 of WAAS in September 2002 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.
WAAS is just one service provider that adheres to the Minimum Operational 

Performance Standard (MOPS) for global Satellite Based Augmentation Systems 

(SBAS). Eventually there will be several services of worldwide geostationary 

communication satellites that broadcast integrity information and differential 

correction data as transmitted by ground reference stations. 
All SBAS systems use the same receiver frequency; therefore any operational 

SBAS system should be capable of providing your GPS unit with increased 

accuracy at any location in the world.
Currently, enabling WAAS on your GPSMAP 2106/2110 in regions that are not 

supported by ground stations may not improve accuracy, even when receiving 

signals from an SBAS satellite. In fact, it can degrade the accuracy to less than 

that provided by GPS satellites alone. For this reason, when you enable WAAS 

on your Garmin GPS receiver, the receiver automatically uses the method that 

achieves the best accuracy. 
For more information, go to 

http://gps.faa.gov

.

The GPSMAP 2106/2110 is capable of receiving WAAS satellite signals. 

Effective use of the WAAS satellite signal may be limited by your geographic 

location in relation to those satellites, now in developmental service. WAAS 

satellite signal reception requires an absolute clear view of the sky and works best 

when there are no nearby obstructions such as buildings or mountains. 
WAAS satellites are numbered 33 or higher when viewing the sky view on your 

GPSMAP 2106/2110. Initial reception of the WAAS signal may take up to 15-20 

minutes, then 1–2 minutes afterwards. When WAAS differential correction has 

been received for GPS satellites (numbers 32 or below), a “D” appears in the 

signal bar of the sky view and “Ready For Navigation with WAAS” appears in 

the Status field. To learn more about the WAAS system, its satellite locations 

and current state of development, visit the FAA web site (

Because WAAS requires CPU resources of the GPSMAP 2106/2110 to search 

for and track the satellites, you can disable the WAAS feature to improve unit 

performance if WAAS reception is not available in your area.

1.  On the 

GPS tab, highlight the Setup sub tab.

2.  Use the 

ROCKER to highlight the WAAS field, and press ENTER.

3.  Highlight 

On or Off, and press ENTER.