When multiple users are at a Drone Airpark or other gathering place wouldn't there be signal interference? My MPP instructions say the limit is three but with a common frequency it would seem some separation would be required. Some controllers have two freqs available.
At RC airplane and vehicle use areas, frequency in use flags are on the controllers so overlap doesn't cause problems
At RC airplane and vehicle use areas, frequency in use flags are on the controllers so overlap doesn't cause problems