Slide background Programming Languages
Operating Systems
Slide background
analog, digital and mixed-signal circuit design impedance controlled routing high-speed design database driven development Spice and RF simulation 3D modeling
Slide backgroundSlider ImageSlider ImageSlider ImageSlider ImageSlider ImageSlider ImageSlider ImageSlider Image

Moitessier HAT


The Moitessier HAT (hardware on top) is named after the famous sailor Bernd Moitessier. The HAT provides full, open-source marine navigation features for the Raspberry Pi, officially supported by OpenPlotter. The hardware enables the reception of AIS data that can be visualized on a monitor or tablet. In addition, position information and compass data are processed, which supports navigation.

Moitessier Logo

Product page:


  • Fully compatible with Raspberry Pi models supporting 40-pin IO header
  • High-sensitivity dual channel AIS receiver with SMA antenna connector (better than -112 dBm)
  • High-performance GNSS receiver with integrated patch antenna. An external antenna is supported via BNC connector.
  • 3 status LEDs (AIS status, GNSS status, error)
  • Barometric pressure, compass, heel and trim. Optional humidity and temperature (only reasonable for standalone usage). Sensors are directly accessible via Raspberry Pi.
  • IO headers (optional) to interface with spare GPIOs of the Raspberry Pi and the HAT’s microcontroller (e.g. software emulated I2C)
  • UART signals of Raspberry Pi available on header (optional)
  • Data communication via SPI (AIS, GNSS and meta data) and via I2C (sensor data). Data accessible via device driver and device file.
  • Supports ID EEPROM and automatic device tree loading
  • Firmware upgradeable via Raspberry Pi
  • Officially supported by OpenPlotter
  • Supports all common navigation tools like OpenCPN, iSailor, NV Verlag, iNavx, FUGAWI, and many more.


  • design, schematic and layout of the assembly
  • firmware implementation
  • implementation of the Linux device driver
  • implementation of the production test
  • technical customer support
  • maintaining git repository

Picture Gallery

Field Test