Manual Garmin GPSMAP 495 (page 157 of 179) (English)

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GPSMAP 495 Owner’s Manual 149

Appendix > Learning about GPS

Check Beacon Wiring—the DGPS setting is enabled in the

Interface sub tab on the Main Menu but no DGPS device is

detected.

No Beacon Signal—DGPS receiver is attached, but not

transmitting RTCM data to GPS.

Tuning Beacon

—the receiver is tuning manually to a DGPS

frequency.

Using Differential

—the unit is receiving DGPS corrections.

Scanning for Beacon

—the DGPS receiver is scanning for an

available frequency.

What is WAAS/EGNOS?

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

service to improve the overall integrity of the GPS signal and

increase position accuracy 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 in September 2002, 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.

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 and 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 Garmin GPSMAP 495 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. To enable WAAS, refer to page 6.

For more information, go to http://gps.faa.gov/Programs/WAAS/

waas.htm.

Hi
Does the Garmin 495 perform a ‘predictive turn’ at waypoints, when slaved to an autopilot? Submitted on 21-11-2022 at 12:22
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Garmin GPSMAP 495 Manual

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