Garmin eTrex Legend Cx User Manual Page 87
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- Table of contents
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eTrex Venture Cx and Legend Cx Owner’s Manual 77
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.
The
European Geostationary Navigation Overlay Service
(EGNOS) is the European version of WAAS and
operates in the same manner.
WAAS
is made up of satellites and ground reference
stations positioned across the United States that
monitor GPS satellite data. Master stations, located on
either coast, collect data from the reference stations
and create a GPS data correction message. Master
station uplinks the correction message to the WAAS
GEO satellites using a ground uplink station. Then
WAAS GEO satellites broadcast the WAAS corrected
signal to user in the service area.
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
and EGNOS are just two service providers
that adhere to the MOPS (Minimum Operational
Performance Standard) for global satellite based
augmentation systems (SBAS.) Eventually there
are to be several more 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 eTrex
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/Programs/WAAS/waas.htm.
- INTRODUCTION 3
- Table of Contents 4
- Software License Agreement 7
- Product Registration 7
- Caring for you eTrex 8
- INTRODUCTION > WARNING 9
- INTRODUCTION > CAUTION 10
- GETTING STARTED 11
- Installing the Batteries 12
- Key Functions 13
- Turning on the eTrex 14
- Initializing the GPS Receiver 15
- Using the eTrex 16
- Status Bar - Date/Time Window 17
- Using the Mapping Databases 18
- On-Screen Messages 18
- MapSource map data 19
- BASIC OPERATION 20
- Information page for a 21
- Editing Waypoints 22
- Deleting Waypoints 22
- Original 23
- New location 23
- Moving a waypoint 23
- Projecting a Waypoint 24
- Using Proximity Waypoints 25
- Using the Find Menu 26
- Find By Name 27
- Recent Finds 28
- Finding a Waypoint 30
- Finding a Geocache 30
- Finding a City 32
- Finding an Interstate Exit 32
- Finding an Address 33
- Finding an Intersection 34
- To find a point of interest: 35
- Using Tracks 36
- Data Card Option 37
- To view a track on 39
- Navigating a Saved Track 40
- Creating and Using Routes 41
- Navigating a Route 42
- Route on the Map Page 43
- Route Page 43
- Route Point 44
- Using the Route Page Options 46
- MAIN PAGES 47
- Satellite Page 48
- Map Page 49
- Using Additional Map Data 50
- Changing the Zoom Range 51
- Map Orientation 51
- Map Page Options 51
- Guidance Text 52
- Setting up the Map Page 53
- MAIN PAGES > MAP PAGE 54
- Measuring Distance 56
- Turning Declutter On or Off 57
- Restoring Defaults 57
- Compass Page 58
- Compass Page Options 59
- MAIN PAGES > COMPASS PAGE 60
- Data Fields 61
- Trip Computer Page 62
- Trip Reset Page 63
- MAIN MENU 64
- Routes Page 65
- Highway Page 65
- Setup Menu 66
- System Setup 67
- System Setup Menu 67
- Display Setup 67
- Interface Setup 68
- Tones Setup 69
- Page Sequence Setup 69
- Map Page Setup 70
- Routing Setup 70
- Geocache Setup 71
- Marine Setup 72
- Time Setup 72
- Units Setup 73
- Heading Setup 73
- Proximity Waypoints 74
- Calendar 74
- Calculator 75
- Stopwatch 75
- Sun and Moon 76
- Hunt and Fish 77
- Games Menu 78
- Virtua Maze 79
- GekoSmak 79
- MAIN MENU > GAMES MENU 80
- Beast Hunt 81
- APPENDIX 82
- Optional Accessories 83
- Data Field Definitions 84
- Connecting Your eTrex to a 86
- Computer 86
- What Is WAAS/EGNOS? 87
- Map Datums and Location 88
- Loran TD Setup 89
- Regulatory Compliance 90
- Limited Warranty 91
- PPENDIX > LIMITED WARRANTY 92
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