I have thought about installing cups on mine. My G17 goes with me when I go fishing. There are far too many drunks that will try to park thier jet boats on top of you.
Search my name for the story of my pregnant wife and I anchored in our 12ft row boat and the three guys pushing us sideways with thier jet boat cuz we didn't move fast enough.
Anyway, ya, there is little to no chance being able to use it if I got dumped out, but it would be a bit nicer knowing I could.