Whites Surfmaster PI Pro and Whites Surfmaster PI, Minelab Excal NY blue sword. 2 White's Dual field pi, Garrett sea hunter pi II (but don't use it for obvious reasons) 5' x 3 1/2' coil underwater Pi
That is a hard one. Rocky can be hard to work with anything. Most scoops are made for sand and gravel. But they do work to pick up or flip rocks. Good luck!
In rocky rivers - I usually wear my mask & snorkel and a pair of gloves and drop down and fan
you'd be surprised at what size rocks can be easily moved with the wave of a hand under water
sent you a PM with site that has story I did on scoops