Anyway, what's wrong with an annoying combined 'quacker' and air horn?
Main thing is to have a bloody great big SMB. Not one of those pointless training sized ones, but a big man-sized one; 6foot/2m long and thick. Girth's far more important when it's on the surface; length comes into it's own when you've surfaced and can't see the boat. Hold on to it so it's vertical. Skipper can see that way further than a whistle in the wind.
If you're really stuck, get out your backup SMB and clip them together for a restful V sign whilst you wait.
(But this being DIR, the backup SMB is in your team-mate's pocket)
Main thing is to have a bloody great big SMB. Not one of those pointless training sized ones, but a big man-sized one; 6foot/2m long and thick. Girth's far more important when it's on the surface; length comes into it's own when you've surfaced and can't see the boat. Hold on to it so it's vertical. Skipper can see that way further than a whistle in the wind.
If you're really stuck, get out your backup SMB and clip them together for a restful V sign whilst you wait.
(But this being DIR, the backup SMB is in your team-mate's pocket)