# SparkFun GPS-RTK-SMA Base Kit **URL:** \ **Category:** Kits\ **Created:** [November 28, 2022, 7:21pm UTC](https://community.sparkfun.com/t/sparkfun-gps-rtk-sma-base-kit/44795 "2022-11-28T19:21:33Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![andres](https://avatars.discourse-cdn.com/v4/letter/a/a4c791/32.png) [@andres](https://community.sparkfun.com/u/andres)\ **Post date:** [November 28, 2022, 7:21pm UTC](https://community.sparkfun.com/t/sparkfun-gps-rtk-sma-base-kit/44795/1 "2022-11-28T19:21:33Z")
Hello I have some agricultural land to measure. I would like to know if apart from the SparkFun GPS-RTK-SMA Base Kit which would be the best option for the rover. I have 3 rasperry pi 4 in stock that I could have as a complement to your sparkfun gnns-rtk cards. My question is whether to measure polygons with a precision of 14mm the rover must be the same card as the base station? SparkFun GPS-RTK-SMA Kit or can i buy : 1.- SparkFun GPS-RTK Dead Reckoning ZED-F9R Connection Guide EITHER 2.- SparkFun GPS-RTK Dead Reckoning pHAT for Raspberry Pi, taking advantage of the fact that I have some raspberry pi 4 available. Can the SparkFun GPS-RTK Dead Reckoning pHAT be used as a rover to measure polygons with an accuracy of 14 mm without being installed in a car or without being installed in a drone? I would like to install it in my drone in the future, for now only as a rover for the base station. Thank you for your prompt response, explanation and recommendation. Thank you very much. ---
**Author:** ![bidrohini](https://avatars.discourse-cdn.com/v4/letter/b/ecae2f/32.png) [@bidrohini](https://community.sparkfun.com/u/bidrohini)\ **Post date:** [December 18, 2022, 11:07am UTC](https://community.sparkfun.com/t/sparkfun-gps-rtk-sma-base-kit/44795/2 "2022-12-18T11:07:56Z")
I think it’s better to proceed with SparkFun GPS-RTK-SMA Kit. Because it is a standalone kit. No further controller will be needed.