SparkFun GPS-RTK Dead Reckoning ZED-F9K Hookup Guide
bboyho, 
Elias The Sparkiest 
Hardware Assembly
For this example, I used a SparkFun Thing Plus - ESP32 WROOM and associated USB cable. Connecting the boards with Qwiic cable, the assembly is very simple. Plug a Qwiic cable between the Thing Plus - ESP32 WROOM and SparkFun GPS RTK Dead Reckoning ZED-F9K. Then plug in one of our patch antennas to the SMA connector If you're going to be soldering to the through hole pins for I2C functionality, then just attach lines to power, ground, and the I2C data lines to a microcontroller of your choice.
When using the ZED-F9K, you will want to orient the board according to the guidelines explained earlier. Below is a top-down view with the board pointing up. Your setup should look similar to the image below.
Make sure to secure the board above a vehicle's dashboard using some tape or sticky tack when prototyping and testing. For best signal reception, it is suggested to guide the antenna from the inside of the car and through a window before attaching the GPS on top of a car. We recommend the magnetic mount GPS/GNSS antenna to easily mount.
Adding a RTCM Correction Source
To get the most out of the ZED-F9K you will need an RTCM correction source. There are a few methods of adding a RTCM correction source. If you have been following along with our GPS-RTK and GPS-RTK2, you can pipe correction data from a wireless network, LoRa, or cellular network. Depending on your setup, you will probably need a ZED-F9P for a correction source. For more information, check out these tutorials.