I'm not ready to abandon my Iris+ yet because it's still useful, but the detected altitude (and other GPS numbers) change constantly when it's sitting on a table.
I have a bluetooth Garmin GLO that I use in actual airplanes that I put on the same table and connected to Foreflight. It sits steady at 736 meters.
The Iris Fluctuates between 735 and 750 meters while sitting on the table. The position moves around laterally, probably 5-10 meters. Again, the Garmin glow shows speed as zero
HDOP is 1.7 with 9-13 satellites.
Is there a replacement GPS unit that people have had success with? Maybe with an external antenna?