Raymarine Smartpilot Autopilot Components Smartpilot Linear Drives
For vessels with mechanical steering systems

Type 1 Linear Drive
For mechancically steered vessels up to 22,000lb (10,000kg) 
Stock # RA81130          M81130 Linear Drive 12V          Price  $1319.00     Buy One Now

Type 2 Linear Drive
Type 2 (short) Linear drive for mechancically steered vessels up to 33,000 lb(15,000kg). 
Stock # RA81131          M81131 Linear Drive 12V          Price  $1529.00     Buy One Now

Type 2 Long Linear Drive
Type 2 (long) Linear drive for mechancically steered vessels up to 44,000lb (20,000kg) 
Stock # RA81132          M81132 Linear Drive 12V          Price  $1529.00     Buy One Now

Technical specifications can be found at - Raymarine