'Muff" an excellent idea with the balloons
Some people are just too smart
yr other suggestions are great also but few would go to that much trouble if flying on the odd time over water etc.
So if I where to be involved ina search for "Muff' & I saw coloured balloons down there amongst a sea of nothing I'd say to me other rescurers....hey look it's 'Muff' having a party bolloons & all !
CW