Holystone HS100 Instructions For Use Manual page 19

Compass Calibration Part 1
—Hold the drone horizontally; Rotate the drone 360° on its center
axis until the Back LED Flight Indicators switch to solid Purple.
Compass Calibration Part 2
—Hold the drone vertically and battery point to sky; rotate the
drone 360° on its center axis until the Front LED Flight Indicators
turn to solid White.
Compass only need to calibrating when you first fly the drone at new area.
ATTENTION: If the LED Flight Indicators keep blinking instead of turning solid,
it indicates the process FAILED. You must start over and repeat the previous
steps until the process is successful.
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