How far is that Carnival from the Audit?
Could it be possible to have a repeater in a vehicle parked near the audit?
don't mind me, i'm running thru a few scenarios to see if there was someway to get a signal to the audit machines or have they signal locked the area as no signals can go to and/or from the audit area to a source, or maybe that is why the aircraft is circling the area to block or look for a stray signals…