SV-ADAHRS-201 Secondary ADAHRS Module for Redunancy.(Includes SV ADAHRS 201 and SV OAT 340) SkyView ADAHRS Modules: ADAHRS stands for Air Data Attitude Heading Reference System. The SkyView ADAHRS module uses MEMS sensor technology to accurately measure inertial, magnetic, and air data. These provide the data necessary to drive the Artificial Horizon Synthetic Vision, Airspeed, Altitude, Vertical Speed, Slip, Turn Rate, Angle of Attack, and Gyro Stabilized Heading. Additionally, Outside Air Temperature