Expand the autoguiding window from the autoguiding mini window.
On the right side of the expanded guiding window, there is a large "i" inscribed in an open circle. (For now, it is the top icon in a column of icons.)
Tap on that icon and ASIAIR should open a Calibration Data mini-window.
Tap on Clear to clear existing calibration.
Close the mini window by tapping again on the "i" icon.
Next time you start guiding, it will first go through the calibration phase.
You can also force recalibration each time you restart ASIAIR by turning off "Auto Restore Calibration" in the Guide Settings window.
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