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I've been working with a ProPak V3 recently also. The node expects to receive data in string formats. The first thing you could do is check with a serial tool like minicom or cutecom that data is actually received by the computer and that it's not binary (it might be, depending on how your GPS is configured). Don't forget to test the GPS outside and wait a few minutes for the signal to be aquired.
To configure the GPS I used the Novatel Connect app (Windows) to send the serial commands. The program can also confirm that your GPS is working as it should. We used the GPGGA mode, I think the command to enable it is as follow:
LOG COM1 GPGGA ONTIME 1
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