Wind Information Features and Screen

Wind is very important to a glider pilot. It can dramatically effect the glide angle over the ground, and if you can reach your target waypoint or not. For example, a 10 knot head wind can reduce the glide angle of a typical club class glider by 20% or more.

Wind Features

SoarPilot is able to calculate the wind from the GPS data 1) when you are thermalling, then can use this data in the calculations it makes.

The wind data is used to:

  • Adjust the final glide calculations to the target waypoint
  • Adjust the Speed To Fly (STF) values
  • Display the Required Ground Speed (RGS) rather than airspeed for speed to fly values
  • Adjust which waypoints are in-range from the glider’s current position
  • Adjust the Final glide Around (FGA) remaining turnpoints calculation in a task
  • Adjust the Final Glider Over Terrain calculations

The wind information is displayed on the:

  • the Wind Info screen described below
  • Final Glide screen in the HW field
  • Moving Map screen as an arrow displayed around the glider symbol showing the direction and number showing the wind speed.


In this case it shows a head/cross wind coming from the right, with a speed of 10 wind units. The wind units (knots, mph, kph or m/s) are selected on the Units Setup screen.

Wind Info Screen

This screen displays the detailed wind information and also has options to control the calculation and display of the wind values in the program. Pressing the Profile button takes you to the Wind Profile Screen.

Field Description
Mode CRUISE or THERMAL depending on current flight pattern of the glider
Turn Dir Shows the current / last turn direction of the glider
Speed/Dir Speed and direction of the current wind calculation
Avg Spd/Dir Average wind speed and direction used in the calculations
Avg Thermal Lift Last average lift while thermalling
Option Description
Wind Profile Controls if the arrows on the Wind Profile screen are in North-Up or Track-Up orientation
Wind Calc Controls if the wind calculations will be done by SoarPilot, or the data will be accepted from a logger that provides this information (See manual wind calculations)
Update Final Glide Headwind Option to use the calculated value in the final glide calculations. This option should normal be selected
Headwind as Positive Value Option to show a headwind as a positive value i.e. +10 knots. If this is not selected, a 10 knot headwind would be displayed as -10 knots.

You can also adjust manually the wind speed and direction. These adjusted values will be overwritten when the system calculates the wind again unless you turn the calculate wind option off. This is useful on a long final glide, or when you don’t expect the thermal again for a while and have some better wind reports.

The on-screen buttons are replicated by the hardward buttons for ease of use in-flight.

Manual Control Effect Button
< Rotate wind direction 10deg to the Left Calendar
> Rotate wind direction 10deg to the Right Phone
Reset Reset the wind speed and direction
+ Increase the wind speed Todo
- Reduce the wind speed Memo

Manual Wind Calculation

If the wind calculations are turned off , you can tap the “Speed/Dir” button that appears to enter manually your glider compass bearing and airspeed. This is then used to calculate the wind speed, from the GPS track and ground speed.

This is useful when flying in wave at a constant speed and compass bearing. You must tap the “Confirm” button to use these calculated values for SoarPilot wind calculations.

Note: The latest wind calculation is still shown on the Wind Info screen, but only the manually set values shown in the Average speed and direction will be used.

Wind Profile

This screen displays the changing wind strength and direction with height. You can access this directly from the Flight menu, or from the Wind Info screen above. The values are built up during the flight as the program calculates the wind at various heights.

The arrows represent the wind direction and strength, the longer the arrow, the stronger the wind. The line on the right of the screen shows the wind strength in a graph form. If the wind strength is off the scale of the graph (a very strong wind) this is shown with an arrow in the right of the graph.

The following buttons can be used to change the range of the Wind Profile being viewed.

Button Function
ToDo Move up in the Wind Profile
Memo Move down in the Wind Profile
Page-Down Decrease the interval size
Page-Up Increase the interval size

Tapping in the graph area on the right of the screen will toggle the display to show the latest sample in each band and how many samples a band contains. This is useful to be able to judge how accurate this information may be.

1) If you have a C302, B50 or LX in the Comp field on the NMEA/Port Setting screen, then wind information is taken from flight computer
soarpilot/wind_information_features_and_screens.txt · Last modified: 2010/04/13 02:36 by pgleesonuk
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