Why does the vertical ascent/descent measurement differ from zero even though I am inside and staying in the same altitude?
The resolution of the vertical ascent/descent rate is 1 m/1 ft whereas the resolution of the altitude is 5 m/10 ft. Therefore the ascent/descent rate can show vertical movement even though the altitude reading stays within the 5 m/10 ft resolution range. Inside buildings the Wristop Computer detects unnoticeable air currents and pressure changes caused for instance by opening a door or a window. In Altimeter mode the Wristop interprets these pressure differences as vertical movement.
