geoprimsField-grade geospatial math

VFR cross-country

Distance and true course between two airports, the heading to fly into the wind, the magnetic heading, and the time en route.

For pilots · 4 steps · each opens with the values filled in

Planning and education aid. Not for primary navigation. The values here are an example; use your own. Full disclaimer

  1. Step 1

    Distance between two points (geodesic)

    Distance and true course from Centennial (KAPA) to Colorado Springs (KCOS).

    You should see The shortest distance is 85.815 km, leaving on a course of 171.3605489° and arriving on 171.45432°.

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  2. Step 2

    Wind triangle: heading and groundspeed

    Correct the true course for the forecast wind at cruise.

    Carries course from step 1.

    You should see Fly heading 179.1° for a groundspeed of 111.2 kt, a wind correction of 7.7° to the right.

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  3. Step 3

    True and magnetic bearings

    Turn the true heading into the magnetic heading you will hold.

    Carries bearing from step 2.

    You should see The converted bearing is 171.7°, using 7.4° E of variation.

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  4. Step 4

    Time, speed, and distance

    Distance over groundspeed gives the time en route.

    Carries distance from step 1, speed from step 2.

    You should see At 111.2 kt, 46.3 NM takes 25 min.

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