It's a problem at drop zones too. I've see many pilot's just fly straight over at Chatteris, even when parachutists are falling
I assume gliding and parachute zones are not on some GPSs?
Gliders also infringe the drop zone, a few weeks back the fully loaded Twin Otter was stuck circling at 14,000ft while a glider was thermaling blissfully unaware over the drop zone
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