Halcyon Multifunction Compensator, Owner'S Manual

9

Fine-Tuning Your MC System

The MC harness is the model of simplicity.  The Secure Harness 

utilizes one D-ring on each side of the chest, avoiding the 

unnecessary clutter of multiple attachments. One D-ring is 

located on your left hip and single D-rings are placed on the 

front and back of the MC crotch strap. The hip D-ring is used 
to attach a pressure gauge, stage bottles, or small tools during 

a dive. 

The knife is placed in an open sheath on the waist belt left of 

the crotch strap, where it can be quickly deployed with either 

hand. The knife is small and designed as a tool for cutting 

line. Two backup lights are attached, one to each of the two 

chest D-rings. These lights are held to the strap by an elastic ring. 

This location puts the lights in a streamlined position against your 

chest while remaining completely accessible.

Once you have properly sized your Secure Harness, you will want to 

fine-tune the position of the five D-rings. The shoulder D-rings should 

be positioned relatively high on the shoulder straps, especially if you 

plan to utilize stage bottles in your diving. If the D-rings are too low, the stage bottles will 
hang too far away from your body, causing significant drag and possibly damaging marine 
environments. The shoulder D-rings should also be high enough to allow for proper storage of 
your Scout back-up lights and to allow for ease of use of your wing’s inflator hose to adjust trim 
and buoyancy, yet not so high that you can’t clip an item off with the same side hand as the clip.

To position the shoulder D-rings, extend your arms straight out to the side, parallel to the 
ground. Bend at the elbow and bring your thumb straight to the shoulder strap. The center of 
your thumb should intersect the center of the D-ring (Figure 5). Next, reach across your body to 
(or almost to) your left shoulder with your right arm (Figure 6). Make sure the right side D-ring 

Fig. 5: Locating the proper location for  

the chest D-rings

Fig. 6: Checking final placement of the chest D-ring