Runway Remaining

Runway
Remaining

Advisory runway-remaining monitor. Runway data and weather are pulled live from the FAA; your position never leaves the device.

iPadOS requires a tap before it will release motion data.

Acquiring position…

Nearest airports

Waiting for a position fix…

Open any US airport

Type a 3 or 4 character identifier. Two letters lists a state, e.g. PA.

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Weather —

Runways · wind components

Armed · holding short

Lined up — —

Datum Stop on the threshold — your stopped position becomes the start of the runway. GS 0 kt

Wind on runway

Headwind—

Crosswind—

Monitoring starts automatically at 15 kt ground speed.

—ADEQUATET+0.0s

100%

RUNWAY REMAINING

FEET REMAINING

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GROUND SPEED

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ROTATE AT

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CONSIDER ABORT IF SAFE

THRESHOLDDEPARTURE END

Takeoff log

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Runway used

Aircraft & thresholds

Rotation speed (V_R)

kt

Adequate — green at or above50%

Caution — yellow at or above35%

Below the caution figure the screen floods red and the abort advice flashes.

Display & alerts

Advisory only. V_R and the thresholds are yours to set from the AFM. The app does not compute takeoff performance, weight and balance, or contaminated-surface corrections.

Sensors & data

What the monitor is reading, and how it degrades when an input is missing

Monitor status —

Lift-off confirmation

Takeoff is confirmed only when a sustained positive rate of climb is fitted through the last 2.0 s of GPS altitude and the runway rumble in the accelerometer drops away. A single bump, a seam impact or a soft-field skip cannot trigger it: the detector regresses over the whole window, requires a minimum total altitude gain, and extends the window when vibration is heavy.

Where the data comes from

Runway geometry, lengths, surfaces and elevations come from the FAA's own airport record (the same NASR source AirNav republishes) and weather from the FAA METAR feed, both fetched on demand per airport and cached on the device. AirNav itself is not used: it serves no cross-origin headers and its terms prohibit scraping.