I'm not sure about power requirements, but you should have no problem using it with OpenPlotter. It outputs serial NMEA data, as opposed to using SDR devices, which require some decoding by the PI.
So, just configure another serial NMEA input stream at 38400 bps. You can filter the incoming strings if you wish, but is shouldn't be necessary.
EDIT: Ha! That'll teach me to read more carefully. You are talking about the hat, not the USB device. Still, it shouldn't be a problem, it's just a different serial input to the PI, or I2C. Regardless, it should work fine.
So, just configure another serial NMEA input stream at 38400 bps. You can filter the incoming strings if you wish, but is shouldn't be necessary.
EDIT: Ha! That'll teach me to read more carefully. You are talking about the hat, not the USB device. Still, it shouldn't be a problem, it's just a different serial input to the PI, or I2C. Regardless, it should work fine.