6 layers68.9 × 47.5 mm

Mowi
septentrio-gnss/mowi
Mowi is an Open Source hardware project that combines a compact Septentrio's GNSS receiver mosaic with a wireless ESP32 Wrover module
283 parts35
KiCad boards from 2 GitHub repositories tagged “rtk”, the most starred first; open any of them in PCBKit.

septentrio-gnss/mowi
Mowi is an Open Source hardware project that combines a compact Septentrio's GNSS receiver mosaic with a wireless ESP32 Wrover module

Will946/GNSS
u-blox ZED-F9P RTK GNSS breakout board with dual-band L1/L2 reception and centimeter-level positioning accuracy.