https://www.sparkfun.com/sparkfun-triband-gnss-rtk-breakout-mosaic-x5.html
The SparkFun Triband GNSS RTK Breakout features the Septentrio mosaic-X5 for centimeter-level L1/L2/L5 accuracy, anti-jamming technology, and a web interface.
sparkfun electronicstribandgnssrtkbreakout