Antenna Tracker with Mission Planner in middle

Hello,
I am attempting to set up an antenna tracker system where the ground station is in the middle of the AT and drone.

The drone connects and operates fine using a pixhawk4 transmitting GPS and telemetry data to the ground station. The antenna tracker will be on an APM 2.8 board, which will be connected via USB cable.
The issue is, how does one hand off the GPS data of the drone to the Antenna Tracker system, when the USB cable is connected to the same PC as the drone system? Each in separate instances of MP show up but cannot appear at the same time.

Any help or tips would be appreciated.
Allen