Halcyon Multifunction Compensator, Owner'S Manual

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of-water, yet still remain snug enough so that your tanks are secure while stage bottles clipped 
off to the top D-ring stay close to the chest. 

To finalize the fit of the harness shoulder straps, loosen the straps enough to allow easy 
movement of the backplate. Position the backplate for proper tank position, with the top of the 
backplate high enough to touch by reaching behind your head with either hand; if you can touch 
the backplate, you should be able to reach your valves when your rig is fully assembled (Figure 
4).  With the backplate in position, tighten up the arm straps until you are able to fit two or three 
fingers underneath the strap. You should be able to easily slide the straps off of either shoulder. 

Be careful not to leave excessive slack in the harness straps. An exceedingly loose fitting 
harness will allow the backplate to ride low on your back, making it nearly impossible to reach 
your valves. 

The crotch strap should be comfortable and allow you to reach your tanks. The  waist belt should 

fit as snug as is comfortable. Do not overtighten the waist belt 

so much as to restrict breathing. When adjusting the waist belt, 
make sure to set the buckle so that it is off to your right side.  
With the buckle in this position, the crotch strap is unable to 
accidentally open the buckle.  The waist belt buckle (and/or 
another buckle) can be used to hold your Helios or Proteus light 
canister in place.

To adjust the crotch strap, buckle the waist strap without running 
it through the crotch strap.  Now pull the crotch strap up to the 
waist belt. Set the length so that the top of the crotch strap loop 
extends a half-inch (12mm) over the top of the waist belt.

While standing on land, your MC should be snug but not 
uncomfortably tight. In the water your harness should be snug 
enough to prevent notable motion of the cylinder as you change 
orientation, but not too tight so as to bind or restrict your 
complete range of shoulder and arm movement.

Fig. 3: Allow for at least two fingers of

spacing between the harness strap and your 

exposure suit

Fig. 4: Proper placement of backplate