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RaceChrono for iOS
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I am new to RaceChrono but after searching around could not find any option to calibrate the device. How the acceleration is calculated if switch from portrait to landscape? How accurate acceleration value is?
The "Longitudinal acceleration" and "Lateral acceleration" channels are calculated from GPS data, so they are not "real" accelerometer values, although with a good GPS they are pretty close.
You can enable "Internal sensors" in settings, which will record the raw X/Y/Z value from the internal accelerometer, as well as raw values from magnetometer and gyroscope. The values are in no way calibrated or rotated.
for an accurate acceleration value is iPhone internal gps enough or need to have external GPS?
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