Features: - APM2.6 flight controller board: Compatible with official Arduino products; - With one top-pin and two side-pin connectors; - Includes 3-axis gyro accelerometer and magnetometer along with a high-performance barometer; - With 4 MegaByte Dataflash chip on board for automatic data logging; - One of the first to use Invensense's 6 DoF Accelerometer/Gyro MPU-6000; - Barometric pressure sensor upgraded from Measurement Specialties to MS5611-01BA03. Atmel's ATMEGA2560 and ATMEGA32U-2 chips for processing and USB functions respectively. - HMC5983 External Compass Mold: If you're having trouble with magnetic noise affecting your compass onboard the APM 2.6 board you may want to switch to an external compass that you can mount further away from noise sources such as motors. - Features: - APM2.6 flight controller external compass magnetic sensor - High precision - With temperature compensation - Plug and plug with installation hole easy to mount.