My advice myself is to stay close to the beach . If you do then the shark will stay away since i heard they don't like shallow water & will stay from it .Plus if a shark is coming at you most people will just try & get away from it & not do anything else.
Lol, you do that, sharks hunt in shallow water. Baby tigers and wobbygongs live in a slight bay near Chenyes, we used to camp there, they targeted white bikinis. It was hilarious. Almost like bull fighting. I also have a friend who was bitten by a shark, during school swimming lessons. Direct quote from the teacher "those sharks dont have teeth" well, this girl still has an epic leg scar to prove that wrong!
Great Whites are off my coast too. Especially right now, the Salmon are running. There is a beach called Salmon holes where you can catch a wave and knock out you're dinner with the board on the way. I have another story of when we went there at boarding school, girls in the shallows, boys in the surf. The boys came back white faced,a great white had breeched within 20 m of them. The beach drops off into very deep water.
We used to stand on the cliffs and check it out. Mostly grey nurse sharks, which were big but harmless, if they were around, we swam. Dolphins and birds also gave us a good indication (no sexy surf lifesavers down here).
There is a whaling station that shut decades ago, but the sharks still wait around for the whale parts. Its so interesting!
I agree with
@DeadlyDuo that a sound wave type thing is a good idea. They do sell these already for personal use. Getting the right sound, might need work.
I was listening to a bubble physicist the other day who said certain radar sounds from boats,upset a fish's swim bladder, and ultimately the equiptment used to find schools of fish, can also kill them.
We have enviro nets trailing at beaches in the state now (after their failed - lets lure 'em to swimming beaches and catch em all! I dont think they caught a single great white)
Chomp chomp