What type of airspace were you in? Most likely they were VFR so it is see-and-avoid unless it was Class B airspace. In that case, it is the controllers responsibility....although the controller will get to go home that night


BTW, the person who posted about the marker beacons reminded me of when I was a PPL only (now IA). I was flying back near Santa Cruz, CA on a quiet, very calm evening with the sun setting over the Pacific when myself and my 3 passengers heard beep beep beep, beep beep beep. I started trouble shooting..... AP wasn't on, definitely not the transponder, definitely not the comms, I was using GPS and that wasn't doing it. Hmmmm, a few seconds later the beeping is gone. Turns out it just happened that the SNS ILS was tuned in, just happened the marker beacons were on (on high nonetheless) and just happened I was perfectly on course. It scared the hell out of my passengers even after I told them it was nothing. A packet of peanuts, a FULL can of coke and they were smiling again. ;-)