The type of Mooring buoy you require will depend on the type of mooring you have.
As a general guide we would recommend
Swinging Mooring - Use Majoni Solid Eye Buoy, Polyform US A Series or Polyform US CC Series
 Fore & Aft Mooring - Use Majoni Rod Buoy or Polyform US CM Series

Polyform US - CC Series Mooring Buoys
CC Mooring Advice
When using the CC Series as a mooring buoy following these simple instructions will achieve the maximum use and durability of the product.
  1. The CC Series has a flexible centre tube and you must first insert a rigid PVC or aluminium pipe into it. DO NOT inflate the buoy until you have inserted the pipe.
  2. For easy insertion lubricate both the tube and the pipe prior to inserting. Make the pipe long enough to have about 8 cm extending beyond both the top and the bottom of the buoy.
  3. Insert an appropriately sized pin for your load through the chain and the top of the pipe.
  4. Attach a moused shackle to the chain at the bottom of the buoy.
    (moused shackle means fixing a wire or cable tie through the eye of the shackle pin and then onto the shackle to ensure the shackle remains firmly secured).
  5. Attach the mooring or anchor chain from the sea bed to the shackle.
  6. Attach the mooring line, with a thimble in the end onto the same shackle.

    You can now be confident that your boat is securely moored to the ground tackle and not just to the buoy.

Majoni Rod Mooring Buoy and Polyform Norway foam filled mooring buoys
Cm Mooring Buoy Advice
To work out what size buoy you require you need to determine the weight of the chain it has to support.
  1. To calculate the amount of chain needed -
    You will need to know the depth of the water at high tide and multiply it by 1.5.  This is the length of chain from the ground tackle to the buoy.
  2. All chain has a stated weight per foot.  Calculate the total being used and add another 25% of the total for safety.   This will give you the amount of buoyancy required. 
  3. Always use chafing gear where mooring lines run through bow chocks or are likely to contact deck hardware, and a thimble on the shackled end will prevent chafe at the buoy.
  4. When picking up a mooring, always use the top ring to pick the buoy with a boat hook. Then shackle the mooring line to the mooring chain shackle at the bottom of the buoy, rather than to the buoy itself. This puts all the strain on the anchor chain, rather than the buoy.  You can  now be confident that your boat is attached to the ground tackle and not just relying on the buoy.