Garmin GPSMAP 2210 Bedienungsanleitung PDF herunterladen (Seite 92)

84 GPSMAP 2206/2210 Owner’s Manual

APPendIx > whAt Is wAAs/egnos?

What is 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 conrmed

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 2206/2210 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.

WAAS Capability

The GPSMAP 2206/2210 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 2206/2210. 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 eld. To learn more about the WAAS system, its satellite locations

and current state of development, visit the FAA web site (http://gps.faa.gov).

Because WAAS requires CPU resources of the GPSMAP 2206/2210 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.

To disable or enable WAAS capability:

1. On the GPS tab, highlight the Setup sub tab.

2. Use the ROCKER to highlight the WAAS eld, and press ENTER.

3. Highlight On or Off, and press ENTER.

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