[심심플] 방위

Roll: 0 degrees when the device is level, increases to 90 degrees as the device is tilted up on its left side, and decreases to -90 degrees when the device is tilted up on its right side.

Pitch: 0 degrees when the device is level, up to 90 degrees as the device is tilted so its top is pointing down, up to 180 degrees as it gets turned over. Similarly, as the device is tilted so its bottom points down, pitch decreases to -90 degrees, then further decreases to -180 degrees as it gets turned all the way over.

Azimuth: 0 degrees when the top of the device is pointing north, 90 degrees when it is pointing east, 180 degrees when it is pointing south, 270 degrees when it is pointing west, etc.