Pixhawk4 and GNSS/GPS or RTK?

Hi,

I am new with the Pixhawk 4 and have one with the PxHawk GPS. What is its accuracy?

Is RTK possible?

Thanks

According to https://docs.px4.io/master/en/flight_controller/pixhawk4.html the GPS uses

ublox Neo-M8N GPS/GLONASS receiver

and for more info, check this: https://www.u-blox.com/en/product/neo-m8-series