For those times when you'd like the surface cover to know exactly where you are. For when you're surfacing and there may be boat traffic. For those 'oops' moments where you need a big orange tube to get attention.
The Scubapro SMB is a clever solution to a big problem. Easy to use either on the surface or deployable from underwater when attached to a reel, a SMB is a great bit of kit. Staff favourite!