This Spin Pole Bracket is used specifically to mount a Micro Compass to boats with rotating masts.
To install, remove sticky backing from the foam padding and attach to underside of bracket. Secure bracket to the spinnaker pole using Velcro, cable ties, or even duct tape if you're feeling adventurous.
Note: To ensure accurate readings of your Micro Compass, do not mount bracket too far along the spin pole. The closer the Micro Compass is to the mast, the more accurate your readings will be.