@1poet, the F1 depends on its neutral buoyancy to hover in the water column. This drastically extends drone run times, unlike aerial drones that have to run all motors at all times. The tail thruster enables the drone to dive and rise with minimal horizontal motion, while the side thrusters enable left and right panning. Hopefully that helps!
Though a good answer, i suspect that 1poet meant: can the F1 hover in place (ie, if there's a current) could it lock it's position like a flying drone can? I suspect that's too much too ask for, but locking in on a depth might be a realistic option?