The speed is calculated from GPS/wifi/cell tower & sensor signals. For accuracy within a 100m GPS radius with direct satellite line-of-sight, the speed is perfect. Accelerometer/gyroscope sensors are noisy and cannot be entirely relied upon. With cellnet signals upto 1.5 km radius, the speed is calculated as an average over the last 1 minute. Beyond 1.5km, and as in the case above, 3.2 km, the speed values may be unreliable, and will be disqualified/not displayed in future versions of the app.
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However, we are continuing to improve accuracy by collating inputs from...
more... GPS, cellnet, accelerometer & gyroscope, and removing sensor noise. Improvements will be made in future versions of the app.
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Thanks.