SparkFun RTK Facet

Centimetre-Grade Surveying, Radically Simplified

The SparkFun RTK Facet is your all-in-one solution for high-precision geolocation and surveying. It delivers centimetre-grade measurements in minutes, packing the power of a $10,000 surveying device into a package that is smaller, easier to use, and far more economical.

For basic users, setup is incredibly simple. For advanced users, the RTK Facet is a flexible, powerful, and fully open-source tool. With full calibration by the National Geodetic Survey (NGS), you can trust its professional-grade accuracy for your most demanding projects.

The Easiest RTK Workflow

The RTK Facet is designed to work seamlessly with your smartphone. By connecting your phone to the RTK Facet over Bluetooth, your phone provides the correction data (from an NTRIP service via the internet) and simultaneously receives the high-accuracy NMEA position output.

Professional-Grade Hardware Included

Under the bonnet, the RTK Facet integrates a powerful ESP32 WROOM, the u-blox ZED-F9P GNSS module, a LiPo fuel gauge, and a microSD card slot for logging.

Housed inside the protective dome is a surveyor-grade, multi-band L1/L2 antenna. This is the same antenna element found in our standalone high-performance antenna and features a precise Antenna Reference Point (ARP) for surveying.

Fully Open Source and Customisable

The RTK Facet is a fully open-source hardware product, programmed in Arduino. You have full access to the electrical and mechanical design files, allowing you to inspect, modify, and tailor the device to your exact needs. It is also capable of logging NMEA, RAWX, and SFRBX data directly to the microSD card for post-processing and research.

Note: For a permanent base station, we recommend using our L1/L2/L5 Surveying Antenna connected to a protected Reference Station or a ZED-F9P breakout-based solution. See our DIY GNSS Reference Station tutorial for more details.

Antenna Phase Centre:

• L1: 71.8mm
• L2: 67.3mm
• Average: 69.55mm

NGS Calibration Data:

• Reference Drawing including North Reference Point
• ANTEX
• ANTINFO