I don’t want to say they were spying, but they were probably spying. Which really makes it whack a doo that they just sat out there and got caught.
Again though - the eye of a drone is much more powerful than human eyes from ground level.
You would think any mission this close to waters that Iran claims would be pretty scripted with lots of contingency plans. This almost looks amateurish and the depths of those waters are very well mapped - military GPS is much better than bitching Betty GPS on the dash of my car.
Would guess there is some major puckerage going on right now with Navy brass.