Testing Galileo and Beidou

Can I test acquiring a position from Galileo or Beidou on inReach Messenger, while ignoring GPS signal? I would really love to be able to test it occasionally. The ability to use these GNSS was one of the winning factors for me to pick inReach messenger against any other communicator. There are more and more cases of GPS jamming, so having alternative GNSS is a big plus. Also, I'm planning to use my inReach when crossing the ocean by boat, as a secondary source of position - if main chartplotter dies, or GPS fails, and before resorting to celestial navigation.