Raymarine Evolution systems accommodate hydraulic, mechanical and power assisted stern drive systems. If you are not sure how to determine what type of steering system is installed on your vessel, please consult an authorized Raymarine dealer.
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.
Select your steering type below to explore available drive units...
Raymarine Evolution pilots connect to hydraulic steering systems using a rugged hydraulic pump matched to the capacity of the hydraulic steering system.
If your system is hydraulic...
You'll need to find out the size (in cc) of the hydraulic cylinder ram(s) mounted to the rudder or inboard engine boats, or to the drive unit on outboard engine boats. Your steering system documentation will have this information.
If you cannot find the ram size on your steering system documentation, you can look on the cylinder ram itself for the brand and model number. Once you have the number use our hydraulic cylinder ram cross-reference guide to determine which hydraulic autopilot pump is compatible with your vessel's hydraulic steering system.
Type 0.5 (12V)
Type 1 (12V or 24V)
Type 2 (12V or 24V)
Type 3 (12V or 24V)
Constant Running Pump (12V or 24V)
12V: M81120 24V: M81119
12V: M81121 24V: M81123
12V: M81122 24V: M81124
12V: E12171 24V: E12172
Does not apply here. The drive unit is matched to the ram capacity of the steering system
80cc – 230cc (4.9in3–14in3)
230cc – 350cc (14in3–21in3)
350cc – 500cc (21in3–30.5in3)
500cc - 1200cc (30.5in3 - 73in3)
Maximum Stall Pressure at 12V
57 bar (827psi)
Peak Flow Rate (No Load)
650 cc/min (30.52in3/min
4500cc/min (274.6in3 / min)
In some systems with dual steering rams in parallel, cylinder capacity is the total of both rams. Rams in series only require single capacity valve. Hydraulic steering systems with steering rams over 500cc require our larger constant running pump used in conjunction with the relevant ACU - contact Raymarine for details.
An authorized Raymarine dealer is best suited to installing a hydraulic autopilot system.
Type 0.5 suitable for Volvo D4/D6 Sterndrive applications.