To check an E6B wind correction against a flight-planning app, give both tools the same true course, true airspeed, wind direction-from, and wind speed, then compare the correction’s direction and angle separately from groundspeed. A mismatch often comes from different input conventions or references—not necessarily a faulty calculation.
What you need to compare
The E6B wind-side calculation uses four shared inputs to find wind-correction angle and groundspeed:
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- True course
- True airspeed
- True wind direction
- Wind velocity, expressed as wind speed
Write these values down before using either tool. Keep the units identical and check that both are using true rather than magnetic reference. A useful comparison is only possible when the inputs mean the same thing in both places. The E6B manual describes the required inputs and wind-side procedure.
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- Rotate the disk until the reported wind direction aligns with the true index.
- Mark the wind speed outward from the grommet using the scale for your particular E6B. The number of knots represented by each line varies among models, so follow the instructions for the device in hand.
- Align the true course with the true index, move the slide until the wind dot falls on the applicable arc, and read the wind-correction angle and groundspeed according to the device instructions.
The E6B manual illustrates this construction; use the printed instructions for your specific model if its scale or markings differ.
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Enter the same values in the app
Open the app’s wind, E6B, or flight-planning calculation and enter the same four values and units. App layouts and labels vary, so confirm that the wind direction is interpreted the same way and that the course reference matches the E6B setup.
As one version-specific example, the WingX 2.6 manual documents a Wind subpage with winds aloft, heading, groundspeed, wind-correction angle, and headwind/crosswind calculations. It documents that version only; it does not establish the current interface or assumptions of other apps. Check the help or manual for the app you use rather than assuming all products expose identical controls.
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Compare the outputs in the right order
1. Check correction direction
First ask whether the correction points into the wind: a wind from the left calls for a left correction, and a wind from the right calls for a right correction. Read the direction as well as the numeric angle. Apps may display angle or sign differently, so verify the app’s convention instead of comparing numbers without interpretation.
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2. Compare correction angle
Once direction agrees, compare the angle. The E6B result is read graphically, while an app may show a digital value. Small differences can result from graphical reading or rounding. The available manuals do not establish a universal acceptable tolerance, and they do not provide a controlled accuracy comparison between a manual E6B and an app.
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3. Compare groundspeed
Groundspeed is a separate output of the wind triangle, not another way of expressing the correction angle. Compare it independently, using the same airspeed and wind values in both calculations.
If the results do not match
Before concluding that a tool is wrong, check the inputs and conventions in this order:
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- True or magnetic: Confirm that both calculations use the same course reference.
- Wind from or wind to: Aviation wind direction is normally given as the direction the wind comes from; check how the app field interprets it.
- Units: Ensure wind speed and airspeed use compatible units in both tools.
- Same values: Confirm that no airspeed or wind entry differs, including the report being used.
- E6B scale: Recheck the model-specific knot scale and the wind-dot placement.
- App assumptions: Consult the app’s own documentation for its reference settings and input conventions; defaults are not established uniformly across apps.
Use the comparison as a cross-check, not flight authorization
This procedure helps identify mismatched inputs and understand the wind-triangle outputs. It does not replace normal operational planning, current weather and navigation information, aircraft documentation, or a pilot’s established verification practices. The FAA’s Aviation Handbooks & Manuals index lists pilot reference publications, including the 2023 Pilot’s Handbook of Aeronautical Knowledge with an October 2025 addendum. For current official flight-information guidance, consult the FAA Aeronautical Information Manual, whose page identifies Change 2 as effective January 22, 2026.
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