Inertia, CDLs quarterly Newsletter, presents their Special New Products Edition which features many new and interesting innovations. CDL is a leading international company in the field of subsea inertial navigation and also designs and manufactures a wide range of products for use in the subsea industry. Through Inertia, CDL is able to provide customers with an all encompassing view of what they have to offer customers and a feel for who they truly are as a company.industry. CDL are world leaders in the field of subsea inertial navigation. CDL design and manufacture a wide range of products for use in the subsea industry.