Real Time Kinematic (RTK) is an accurate form of position measurement using GNSS that requires at least two cooperating receivers, a fixed base station set up over a known point, and a mobile rover, which is used for the actual measurement.
<a href="//commons.wikimedia.org/wiki/User:Kavelgrisen" title="User:Kavelgrisen">TS Eriksson</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>