Ping Sonar Altimeter udp port overlap in blue os

I have two Ping Altimeters connected to a vehicle running BlueOS 1.2.0-beta.2
One Ping Altimeter is connected to serial 5 on the Navigator and the other is connected to a Pi USB port via a BLUART converter. How do I change the UDP port for one of the Ping’s? At the moment both of them use the same UDP port 9090.
I can see one of the Ping 1D’s when I open Ping Viewer. I tried creating a bridge from the USB serial port to port 9091 but then I couldn’t see either of them in Ping Viewer.
What is the best way to run 2 altimeters?

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