Verify before flight. Check the POH/AFM for aircraft-specific limits and performance.
Navigation
DME Arc Distance Calculator
Calculate DME arc distance from radius and degrees flown, with circumference and fraction-of-circle outputs for navigation practice.
NM
deg
Arc distance—
Circumference—
Fraction of circle—
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A quarter-circle at 10 DME
At a 10 NM radius, a 90° arc is one quarter of a circle: 2 × π × 10 × 90 / 360 = 15.71 NM.
A 90° change in radial is the angle swept; it is not a 90 NM distance. This geometry excludes entry, exit and any tracking deviations.
Formula and method
Arc length equals the selected fraction of a circle multiplied by the circumference at the entered DME radius.