IF YOU ARE TALKING ABOUT YOUR DIVE FLAG/FLOAT...JUST CLIP IT TO A "D" RING ATTACHED TO THE BACK OF YOUR WEIGHT BELT.
You can pick up an adequate "D" ring at most hardware stores.
If a boat hits your float line and the float is attached to your wrist or something you could get injured easily if the prop catches the line...

I dont like ANYTHING attached to me that I can't quickly and easily "release" one handed - or it has to "break away" easily. Here in Wisconsin almost everywhere I dive is loaded with boats & jet ski's during the summer months.
I also sometimes use a velcro type wrist strap with a velcro loop to attach my dive flag to my wrist...Its actually made by "ACE" of the ACE BANDAGE company...Walgreen's or a pharmacy should carry them. They are for tennis elbow or somthing like that...Works awsome and only like 6 dollars.
Safe diving
