Garmin GPSMAP 3010C User Manual download pdf (Page 111)

GPSMAP 3006C/3010C Owner’s Manual 103

aPPendIX > satellIte InforMatIon and what Is waas/egnos?

appendIX

Satellite Information

Satellite Sky View

45°

90°

Outer ring -

the horizon

Inner ring- 45°

above the horizon

Center dot - 90°

above the horizon

Satellite Location

The location of each available satellite is shown over two location rings on

the Satellite Information Page. The outer ring represents the horizon, the

inner ring represents 45° above the horizon, and the center represents directly

overhead. When the unit is using a satellite for navigation, the satellite number

is highlighted on the location rings. The unit can display satellite location with

North or your current track at the top of the display.

Satellite Strength Indicator Bars

The Satellite Strength Indicator Bars show the strength of the signal being

received and the status of the signal. The bars are either shaded or lled. A hollow

gray bar means the unit is in the process of storing orbital data it is receiving from

the satellite signal. When the bar turns solid green, the unit is using the satellite

signal for navigation. A “D” in or above the bar means differential corrections

(WAAS or DGPS) are being applied to that satellite.

Date, Time, and Current Location

The unit gets date and time information from the satellite’s on-board atomic

clock. When the unit has achieved a 2-D or 3-D GPS location, the current location

is shown in the location format you have selected.

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 3006C/3010C 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 gps.faa.gov.

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