Yes. Real-time Kinematic Positioning (RTK)[0] is a differential GNSS technique of combining data from satellites and fixed ground stations. Since the location o

Yes. Real-time Kinematic Positioning (RTK)[0] is a differential GNSS technique of combining data from satellites and fixed ground stations. Since the location of fixed ground stations has been surveyed, and has a higher degree of accuracy, combining the data can provide a higher degree of accuracy to the downstream consumer of the data. Some states in the US provide RTK data over the internet for free as a public service. If your GPS supports RTK[1], and you have an internet connection, you can feed the publicly available RTK data into the GPS to get very accurate location data. I've successfully integrated RTK and seen ~1cm accuracy. Our navigation device was not cheap, but I think the GNSS chipset in it was pretty common. To get really good GNSS accuracy you will need a clear view of the sky, as you'll need good satellite coverage in all directions to start with. You'll need an antenna mounted in such a way that it's not obstructed. Your antenna will need to be electrically grounded/isolated in such a way that noise is not introduced to the signal before it gets to the GNSS device. Etc. [0] - https://en.wikipedia.org/wiki/Real-time_kinematic_positioning https://en.wikipedia.org/wiki/Real-time_kinematic_positionin... [1] - https://learn.sparkfun.com/tutorials/what-is-gps-rtk/all https://learn.sparkfun.com/tutorials/what-is-gps-rtk/all