Kauai Labs navX-MXP User Manual page 67

Guidance
Terminology
Altitude is a measure of distance in the "up" direction from a reference; navX-MXP (Aero
Edition) calculates altitude above sea-level using a pressure sensor.
navX-MXP (Aero Edition) altitude has a range of 0 to 25,000 meters.
Important Note: Altitude is calculated based upon barometric pressure. In order to accurately
estimate altitude above the earth, navX-MXP should be configured with the sea-level barometric
pressure in the surrounding area. This setting can be configured via the navX-MXP
Configuration Tool.
3-D Coordinate System
A 3-D Coordinate System uses one or more numbers (coordinates), often used to uniquely
determine the position of a point within a space measured by that system. The origin of a 3-D
coordinate system has a value of (0, 0, 0).
navX-MXP features gyroscopes, accelerometers and magnetometers which are all aligned with
each other in a 3-D coordinate system. Each sensor type measures values with respect to that
coordinate system, as follows:
Gyroscopes: measure rotation (as shown in the green arrows) about each axis. The coordinate
system origin represents the center of the navX-MXP circuit board.
Accelerometers: measure acceleration, where the origin represents the position in space at
which the previous acceleration sample was acquired.
navX-MXP 3-D Coordinate System
Advanced
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