A HAT (Hardware Attached on Top) is an expansion board designed to fit the 40-pin GPIO connector of a Raspberry Pi. 

This HAT allows you to transform a Raspberry Pi into an Pypilot computer integrating a radio receiver for remote control and a high-performance compass using a state-of-the-art 9-axis IMU (inertial measurement unit). 

Supplied with an 8-button remote control transmitter and a second, watertight 4-button transmitter.

Combined with a Pypilot motor controller and a Raspberry Pi Zero W  (with the tinypilot-pypilot software installed on its microSD card), this HAT allows you to create a high-performance, low-power autopilot system.

There are several models of motor controller available to adapt Pypilot to all existing drive systems. You can either build your own or purchase one, keeping in mind that while the 12-24V 30A model with clutch control can be used with all existing drive systems, the 12V 7A model without clutch output is only suitable for electric tiller steering systems.

This HAT integrates an LCD screen, a TDK ICM20948 IMU sensor, a UART interface for the motor controller, an NMEA0183 port with a galvanically isolated input, overvoltage protection, a GPIO connector for connecting to the Raspberry Pi, a second Arduino microcontroller for remote control decoding, and a 433 MHz radio receiver. It is also equipped with an EEPROM memory that automatically configures Pypilot according to the HAT's hardware.

The Arduino and the EEPROM are already flashed. 

The HAT is supplied with only one cable, which is used to connect the UART port to the controller.

With a Pi higher than Zero, a GPIO spacer is needed to raise the HAT

Supplied with an 8-button remote control transmitter and a second, waterproof 4-button transmitter.

The enclosure, the Raspberry Pi Zero and the microSD card are not included.

The motor controller is not include