Home | Marine Aids to Navigation | Mooring Solutions Chains 12 to 60 mmLink Chain Diameter As an accessory to your hull or substitution of the mooring system, Almarin can calculate and supply mooring systems. The chain to be used varies according to the application, but the most common quality and recommended for marine aids to navigation is the U2 quality studless chain. Our engineers can help you choose the appropriate dimensions of the chain, based on the model of the shelter in the local conditions. Request moreinformation about Chains