I can get a GPS fix, and my loiter mode operates fine, but I get zero satellites or HDOP in Mission Planner and logs.

I have a Ublox LEA-6H GPS and an APM 2.8. As the title says, I cannot see HDOP or the number of satellites despite there being a sufficient GPS lock for Loiter Mode. In the logs, I can see my latitude and longitude, and most other relevant info, but

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