Features: APM2.6 flight controller board: Compatible with official Arduino products; with vertical and horizontal interface; 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. GPS module: Adopts Ublox NEO-6M chip; With data backup battery for power off saving function; Built-in electronic compass; Built-in ceramic antenna ensures strong signal.