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97190-00607-02 Rev D
Detailed Operation
Radar
Radar Beam from 12 inch Antenna
Garmin GWX 68 Radar Description
The Garmin GWX 68 Airborne Color Weather
Radar is a four color digital pulsed radar with 6.5
kilowatts of power. It combines excellent range and
adjustable scanning profiles with a high-definition
target display. The pulse width is four microseconds on
all ranges except the 2.5 NM range. The GWX 68 uses
a one microsecond pulse width at this range to reduce
the smearing of targets on the display. This allows
better target definition at close range.
To focus radar scanning on specific areas, Sector
Scanning offers pilot-adjustable horizontal scan angle
of 10 degrees. A vertical scanning function helps to
analyze storm tops, gradients and cell buildup activity
at various altitudes.
Principles of Pulsed Airborne Weather Radar
The term RADAR is an acronym for RAdio Detect-
ing and Ranging. Pulsed radar locates targets by trans-
mitting a microwave pulse beam that, upon encounter-
ing a target, is then reflected back to the radar receiver
as a return “echo.” The microwave pulses are focused
and radiated by the antenna, with the most intense
energy in the center of the beam and decreasing inten-
sity near the edge. The same antenna is used for both
transmitting and receiving. The returned signal is then
processed and displayed on the GMX 200 MFD.
Radar detection is a two-way process that requires
12.36 micro-seconds for the transmitted microwave
pulses to travel out and back for each nautical mile of
target range. It takes 123.6 micro-seconds for a trans-
mitted pulse to make the round trip if a target is 10
nautical miles away.
The GWX 68 weather radar should be used to
avoid severe weather, not for penetrating severe
weather. The decision to fly into an area of radar
targets depends on target intensity, spacing between
the targets, aircraft capabilities and pilot experience.
Pulse type weather radar detects only precipitation,
not clouds or turbulence. The display may indicate
clear areas between intense returns, but this does not
necessarily mean it is safe to fly between them. Only
Doppler radar can detect turbulence.
Airborne weather radar has other capabilities
beyond weather detection. It also has the ability to
detect and provide distance to objects on the ground,
such as, cities, mountains, coastlines, rivers, lakes, and
oceans.
- Pilot’s Guide 1
- & Reference 1
- INTRODUCTION 3
- End User License 4
- Welcome… 6
- Accessories and Packing List 6
- About This Manual 7
- Limitations 7
- Introduction 10
- Table of Contents 10
- GETTING STARTED 13
- 2 190-00607-02 Rev D 14
- Message Flag 15
- Power On 16
- Brightness 16
- Rotary Knob 16
- Function (FN) Key 16
- MENU/ENT 17
- Menu Item 17
- Annunciations 18
- Advisory Flags 18
- Getting Started 19
- Basic Operation 20
- Start Up Screen 20
- Function Selection 21
- Normal Cruise Condition 22
- Viewing the Advisory 22
- Returning To Normal Condition 22
- Traffic on Thumbnail 23
- Terrain on the Thumbnail 23
- Obstructions on the Thumbnail 23
- Thumbnail Activation 23
- Polar Navigation 24
- Function Summary 25
- DETAILED OPERATION 27
- Custom Map (MAP) 28
- 17190-00607-02 Rev D 29
- 18 190-00607-02 Rev D 30
- 19190-00607-02 Rev D 31
- Hot Spots 32
- VOR Highlight 33
- ILS/Localizer Depiction 34
- 23190-00607-02 Rev D 35
- 24 190-00607-02 Rev D 36
- Airport Chart (ChartView) 37
- (Page 1) 37
- 26 190-00607-02 Rev D 38
- SafeTaxi 39
- 28 190-00607-02 Rev D 40
- 29190-00607-02 Rev D 41
- Load Chart 42
- VFR Chart (VFR) Function 43
- Flight Plan 44
- Map Orientation 44
- Nav Data 44
- Split Screen (SPLIT) Function 45
- 34 190-00607-02 Rev D 46
- Traffic Alert thumbnail 47
- Vert Smart Key (TAS) 47
- Traffic Status Indicators 47
- No Bearing Advisories 47
- TAS Menu Options 47
- TCAD 9900B Menu Options 48
- TCAD 9900BX Menu Options 48
- ADS-B Traffic (TRAF) Function 49
- Traffic Description 50
- TIS-B Traffic 51
- TIS-B Limitations 52
- ICAO Address 53
- Flight ID 53
- ADS-B Broadcast ID Info 53
- Broadcast FID 54
- Broadcast VFR 54
- 43190-00607-02 Rev D 55
- Graphic Display 56
- Text Display 56
- TIS-A Traffic (TRAF) Function 57
- Alert Hot Key (TA Prompt) 58
- Operate/Standby 59
- Flight Plan (FPL) Function 60
- Terrain (TER) Function 62
- 51190-00607-02 Rev D 63
- TER Data Flag 64
- TAWS Pop-Up Modes 64
- Function 65
- Viewing Text 66
- Clearing Text FIS Messages 66
- Sorting Text FIS Messages 66
- Service (FIS) Function 67
- NEXRAD Abnormalities 68
- NEXRAD Limitations 68
- NEXRAD Intensity 68
- NEXRAD Color Legend 69
- Lightning 70
- Cell Movement 70
- 59190-00607-02 Rev D 71
- GDL 69/69A FIS Echo Tops 72
- Echo Tops Legend 72
- XM FIS Winds Aloft 72
- Winds Aloft Legend 72
- TFR Label 73
- Product Times 75
- 64 190-00607-02 Rev D 76
- Forecast Time 77
- XM FIS County Warnings Legend 78
- 68 190-00607-02 Rev D 80
- Viewing TFR Text 81
- Product Status 82
- Diagnostics 82
- XM FIS Diagnostics 83
- XM FIS Data Activation 83
- Activating XM Radio Services 83
- 72 190-00607-02 Rev D 84
- Lightning Menu Page 1 85
- Display View (360/120) 85
- 74 190-00607-02 Rev D 86
- Noise Monitor 87
- Strike Test 87
- Antenna Change Message 87
- FliteChart (CHART) Function 88
- FliteChart - Chart 89
- Search ID 90
- Select Airport 91
- Select Chart 91
- Overview 92
- Data Card 93
- Chart Geo-Referencing 93
- Selecting the Airport 93
- 82 190-00607-02 Rev D 94
- Display of Coverage Area 95
- Chart Zooming 95
- Chart Panning 95
- Chart Orientation 95
- Chart Info 95
- ChartView Function 96
- View Loaded 98
- Load to Map 98
- Viewing Surface Charts 99
- Operational Considerations 100
- Typical Taxi Scenario 101
- Typical Take Off Scenario 101
- Typical Approach Scenario 101
- Typical Landing Scenario 101
- Radar (RADAR) Function 102
- • Black 103
- • Green 103
- • Yellow 103
- • Magenta 103
- Horizontal Mode 104
- Range Control 104
- Tilt Control 104
- Gain Control 105
- Hold Control 105
- Sector Scan (GWX 68 only) 106
- Radar Alert (GWX 68 only) 106
- Stabilization (STAB) 106
- Target Alert (GWX 68 only) 106
- 95190-00607-02 Rev D 107
- Detailed Operation 108
- 97190-00607-02 Rev D 109
- Radar Signal Attenuation 110
- Precipitation 111
- Ground Returns 111
- Angle of Incidence 112
- MPEL Boundary 113
- Thunderstorms 114
- Tornadoes 116
- 105190-00607-02 Rev D 117
- Radio ID 118
- Save Preset 119
- Last Channel 119
- Channels 120
- Categories 121
- Direct Access 121
- Gather Information 122
- SiriusXM Satellite Radio 123
- System (SYS) Function 124
- Scale, and Transition Speed 125
- Slave Zoom to GPS Zoom 125
- AutoLoad Electronic Charts 126
- Altitude Units 126
- Map Detail 126
- System Information 126
- Feature Information 127
- Hardware Information 127
- Port Status 127
- Data Link Status 127
- Test Pattern 1 128
- Test Pattern 2 128
- Troubleshooting 129
- Appendix 130
- GDL 69/69A FIS Legends 131
- GDL 69/69A FIS Screens 132
- Specifications 133
- Care Information 133
- GMX 200 Safety Monitor Codes 134
- Glossary 135
- Abbreviations 136
- 125190-00607-02 Rev D 137
- 126 190-00607-02 Rev D 138
- Contacting the Factory 139
- Limited Warranty 140
- 129190-00607-02 Rev D 141
- 130 190-00607-02 Rev D 142
- 131190-00607-02 Rev D 143
- 132 190-00607-02 Rev D 144
- 133190-00607-02 Rev D 145
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- Garmin (Europe) Ltd 148
- Southampton, SO40 9LR, U.K 148
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