Both. Long term drift will be extra challenging to correct as the cumulative error is staircase. (Beta distribution) What this is is actually a step counter, c

Both. Long term drift will be extra challenging to correct as the cumulative error is staircase. (Beta distribution) What this is is actually a step counter, combined with step length and heading estimate from an accelerometer w/ gyroscope plus compass. When the counter makes a mistake, the effects will be catastrophic.