Raymarine evolution systems accommodate hydraulic, mechanical and power assisted stern drive systems. The drive unit is the part that interfaces with your vessel’s steering system to keep you on the right course. Raymarine has a broad range of drive units to match almost any type of steering system. Our most commonly used drive types for sailing vessels. Raymarine mechanical linear drives provide powerful thrust, fast hard over times and quiet operation. Mounted below decks, the linear drive moves the rudder directly by pushing the tiller arm or a rudder quadrant. A linear drive unit connects to the rudder stock via an independent tiller arm. Accessory fittings from your steering manufacturer may be required. Must be able to back drive steering system from the rudder.