# HEX/ProfiCNC Here+ RTK GPS (Discontinued)
This GPS is no longer available for purchase but is still compatible with PX4.
Usage documentation can be found in PX4v1.11 docs (opens new window)
The Here+ RTK GPS receiver is a small, light and energy efficient RTK GPS module, based on the u-blox M8P. Using RTK, PX4 can get its position with centimetre-level accuracy, which is much more accurate than can be provided by a normal GPS.