Raymarine EV-400 Power Autopilot (Large Powerboats)

The Raymarine EV-400 Power is the most capable Evolution autopilot pack, designed for large motor yachts and ships with high-capacity hydraulic or heavy-duty mechanical steering systems. This bundle includes the ACU-400 control unit, which can deliver up to 30 A continuous drive output to command big steering gear (such as Type 2 or Type 3 hydraulic pumps or mechanical linear drives). Also included are the EV-1 sensor, the p70Rs control head, and a rudder reference unit that provides feedback on the rudder angle for enhanced steering precision.

The EV-400 Power is the perfect solution for large powerboats with hydraulic steering – from luxury motor yachts in the 40–50 ft range to commercial vessels where heavy loads and conditions demand a robust autopilot. The ACU-400 operates on 12 V or 24 V systems and is engineered to drive large dual-actuator cylinders or powerful constant-running pumps via appropriate drive units (the user pairs the EV-400 with a suitable drive unit, sold separately).

The inclusion of the rudder reference sensor sets the EV-400 apart – this device accurately monitors rudder position and allows the autopilot to make finer, smoother corrections, especially on vessels with large rudders. This is critical for big boats, as it informs the ACU-400 exactly when the rudder is reaching its limits and prevents over-stressing the steering system. Naturally, the EV-400 carries the Evolution intelligence: a self-calibrating compass, 9-axis motion analysis, and algorithms that learn your boat’s handling to improve steering performance with every voyage.

Features like Hydro-Balance™ and other Raymarine optimizations are also present, ensuring your large yacht holds course without unnecessary “hunting” or zigzagging. The EV-400 Power integrates seamlessly into sophisticated marine networks – it’s compatible with SeaTalk^ng/NMEA2000, allowing it to interact with a wide array of navigation devices, MFDs, and sensors. You can control it via the p70Rs head or directly through a compatible Raymarine chartplotter (e.g. Axiom series), giving you flexible options for commanding the autopilot.

Use Cases & Recommendations: The EV-400 Power is aimed at captains of large motor vessels who demand top-tier reliability and accuracy. For example, if you have a yacht with twin engines and a large hydraulic ram at the helm, this autopilot will capably handle steering even at high speeds or in rough conditions. Recommendation: When installing the EV-400, ensure that you properly configure the hydraulic or mechanical parameters (cylinder stroke, rudder end stops, etc.) in the autopilot setup. This will guarantee optimal performance and protect your steering gear. With the EV-400 Power at the helm, your yacht will maintain an accurate course, reducing helmsman fatigue and enhancing safety and efficiency on long passages.