They weren't sure what to make of it at first!
I could imagine using mine like that, and a calving or unwell cow laid up in long grass could be much easier to spot from above.
Cattle here are still in the sheds for a few days yet, and I keep well away as they didn't like it when they could hear it in the field over the road. Definitely best to avoid livestock that are not your own, as the reaction can be unpredictable.