# Holybro H-RTK M8P GNSS (Discontinued)
This GNSS has been discontinued, and is no longer commercially available.
The Holybro H-RTK M8P GNSS (opens new window) is an RTK GNSS module series for the mass market. This family is similar to the H-RTK M9P series but uses the smaller, lighter, and less expensive M8P u-blox RTK GNSS module (which still provides far superior position resolution than previous generations_.
There are three models of Holybro H-RTK M8P to choose from, each with different antenna design to meet different needs. Refer to the Specification and Model Comparison section for more details.
Using RTK allows PX4 to get its position with centimeter-level accuracy, which is much more accurate than can be provided by a normal GPS.
# Where to Buy
RTK setup and use on PX4 via QGroundControl is largely plug and play (see RTK GPS for more information).
All H-RTK GNSS models come with a GH 10-pin connector/cable that is compatible with Pixhawk 4.
The cables/connectors may need to be modified in order to connect to other flight controller boards (see pin mapbelow).