Altair Glide Computer and Navigation System User Manual Page 67
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6 ATMOSPHERE AND INSTRUMENTS
One of the following estimation methods can be set either in the configuration settings (page ‘Glide
Computer’, field ‘Auto Wind’) or in Wind Settings :
• Manual
• Circling
• ZigZag
• Both (ZigZag and Circling)
When wind estimates change significantly, a status message notification of this is issued.
Circling wind algorithm
XCSoar estimates the wind magnitude and direction when circling. It does this using a sophisti-
cated algorithm that incrementally improves the wind estimate from completed turns. Poor quality
turns, where the bank angle changes significantly, are rejected or have minimal impact on the
overall wind estimate. The best turns are those with constant bank angle.
Estimates are only obtained if the average GPS fix rate is better than one every two seconds. This
results in improved fidelity of estimates in the presence of GPS dropouts.
Zig-Zag algorithm
For aircraft fitted with intelligent variometers connected to XCSoar, a so-called ‘zig-zag’ wind esti-
mation algorithm is available. With this algorithm, the wind estimate can be updated continuously
during long glides without circling.
This allows the wind estimate to be updated during cruise while the aircraft performs a zigzag
manoeuver. No specific manoeuver is required, in many cases the estimate will be updated as the
aircraft’s heading changes naturally as the pilot hunts for lift. In general, however, the technique
requires the aircraft heading to change over 40 degrees.
If the wind changes significantly while in straight flight, the zig-zag algorithm is used to update the
wind estimate even if the aircraft’s heading does not change much. This provides greater accuracy
in long final glides.
Wind estimates are updated when a large difference between the estimated ground speed and the
true ground speed are detected even without much zig-zag manoeuvering.
Compass algorithm
For aircraft fitted with intelligent variometers and digital compasses connected to XCSoar, a wind
estimation algorithm making use of magnetic heading and airspeed is being developed. This pro-
vides another method of updating the wind estimate during cruise and does not require zig-zag
manoeuvres.
6.5 Wind settings dialog
Wind Settings allows the initial estimate of the wind speed and direction to be entered, usually
prior to flight. It is accessed via the menu under:
CONF Setup Wind
XCSoar Manual (Altair version) • XCSoar-A-EN 60
- Manual (Altair version) 1
- Revision history 3
- Warnings and precautions 3
- Legal notices 3
- Contents 4
- • XCSoar-A-EN iv 5
- • XCSoar-A-EN vi 7
- 1 Introduction 8
- Start-up and user profiles 9
- Splash screen 9
- 1.4 Through-life support 10
- 1.5 Using XCSoar safely 11
- 2 User Interface 12
- 2.1 Button labels and menus 13
- 2.1.1 NAV menu 14
- 2.1.2 DISP menu 15
- 2.1.3 Pan mode 15
- 2.1.4 CONF menu 16
- 2.1.5 INFO Menu 16
- Default buttons 17
- Dynamic menu labels 17
- 2.2 InfoBoxes 18
- 2.3 Dialog windows 18
- • XCSoar-A-EN 12 19
- 2.3.7 Screen Brightness 20
- 2.3.8 Setup MacCready 20
- 2.3.9 Basic Settings 20
- 2.3.10 Wind Settings 20
- • XCSoar-A-EN 14 21
- 2.4 Status messages 22
- 2.5 Status dialog 22
- Aircraft 23
- • XCSoar-A-EN 18 25
- 2.6 Text entry 26
- 2.7 Sounds 27
- 2.8 Screen 27
- 2.9 Help system 27
- 3 Display Elements 28
- 3.3 Glider symbol 29
- 3.4 Trail 30
- 3.5 Glide range 31
- 3.6 Map elements 31
- Waypoints 32
- Terrain and topology 32
- 3.7 Markers 33
- 3.8 Active task elements 33
- 3.9 Thermal profile 34
- 3.10 Other 34
- GPS not connected 35
- GPS waiting for fix 35
- Final glide 35
- 4 Cross Country Tasks 36
- • XCSoar-A-EN 30 37
- 4.2 Task Editor 38
- • Save only Only save task 39
- • Task type Standard or AAT 40
- • Distance Task distance 40
- • XCSoar-A-EN 34 41
- Page: Waypoints 42
- • XCSoar-A-EN 36 43
- Page: Rules 44
- 4.3 Task calculator 45
- 4.4 Waypoint Browser 46
- 4.5 Waypoint Info 47
- −100%, the target is located 48
- 4.7 OnLine Contest 49
- 4.8 Logger 50
- Setup Logger 51
- 5 Glide Computer 52
- 5.2 MacCready settings 53
- 5.3 Glide polar 54
- 5.4 Basic settings 55
- 5.5 Speed to fly 56
- 5.6 Safety heights 57
- = 0), adjusted for 58
- 5.7 Final glide calculator 59
- +/− 500 meters 60
- 5.9 Task speed estimation 61
- 5.10 Optimal cruise track 62
- Analysis Show 63
- 5.12 Flight notifications 64
- 5.13 Sunlight and time 64
- 6 Atmosphere and Instruments 65
- 6.2 Air data inputs 66
- 6.3 Wind display 66
- 6.4 Wind estimation 66
- 6.5 Wind settings dialog 67
- 6.6 Thermal locator 68
- 6.7 Convection forecast 69
- • XCSoar-A-EN 64 71
- 7.1 Airspace display 72
- 7.2 Incursion events 73
- 7.3 Airspace warning levels 73
- 7.4 Airspace warning dialog 74
- 7.6 Airspace Info dialog 75
- 7.7 Airspace Browser dialog 76
- • XCSoar-A-EN 70 77
- 7.8 Analysis dialog: Airspace 78
- 7.9 FLARM traffic display 79
- • Green for level 0 80
- • Yellow for level 1 80
- • Red for level 2 and 3 80
- 7.10 Team flying 81
- 8 Avionics and Airframe 82
- 8.3 Switch Status 83
- 8.5 Supported variometers 83
- 8.6 Other avionics devices 84
- 8.7 Slave mode 84
- 9 Quickstart 85
- 9.2 FAI Task 86
- 9.3 FAI Task, Manual Start 87
- 9.4 AAT Task, Manual Arm 87
- In-flight 88
- After landing 89
- Prior to takeoff 90
- 10 InfoBox Reference 91
- 10.3 Glide ratio 92
- 10.4 Variometer 93
- 10.5 Atmosphere 94
- 10.6 MacCready 94
- 10.7 Navigation 95
- 10.8 Waypoint 97
- 10.9 Team code 98
- 11 Configuration 99
- Fail-safe 100
- 11.1 Site 101
- 11.2 Airspace 102
- • XCSoar-A-EN 96 103
- 11.3 Map Display 104
- • XCSoar-A-EN 98 105
- 11.4 Terrain display 106
- Colour schemes 107
- 11.5 Glide computer 108
- • XCSoar-A-EN 102 109
- 11.6 Safety factors 110
- 11.7 Polar 111
- 11.8 Devices 112
- 11.9 Units 113
- 11.10 Interface 114
- 11.11 Appearance 115
- • XCSoar-A-EN 116
- 11.12 InfoBox 117
- 12 Data Files 118
- 12.5 Airspace 119
- 12.6 Map 119
- 12.7 Airfield details 119
- 12.8 Glide polar 120
- *Speed2, Sink2, Speed3, Sink3 121
- • XCSoar-A-EN 116 123
- 12.9 Profiles 125
- 12.10 Checklist 125
- 12.11 Tasks 125
- 12.12 Flight logs 126
- 12.13 Input events 126
- 12.14 Language 126
- 12.15 Status 127
- 12.16 FLARM Identification file 127
- 12.17 Dialog files 127
- 13 About XCSoar 128
- 13.3 Open source philosophy 129
- 13.4 Development process 129
- 13.5 User base 130
- 13.6 Credits 130
- • XCSoar-A-EN 124 131
- A GNU General Public License 132
- • XCSoar-A-EN 126 133
- • XCSoar-A-EN 128 135
- No warranty 136
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