Here is one of my RMK 16s in use last summer.  
  
 I am still searching for the right configuration to attach the knife to my gear for diving.  The regular waxed sheath attaches nicely to a belt, but this BC has an integrated weight system and the jacket covers the knife if it is on its own belt.  The waxed sheath does not work well as a leg sheath.  
In this photo, the knife is in a Combat Master sheath which is attached to a D-ring.  This is a decent placement.  However, the keeper strap on this sheath is difficult to snap, especially with gloves on.  A velcro keep would be better.  
I am thinking about having a Kydex sheath made, or picking up an old pancake flipper to use for ankle placement, but they are hard to come by.  Does anybody have any ideas?