An autopilot that needs little or no calibration and it comes with advanced aerospace technology! Raymarine combines its autopilot expertise with aerospace guidance technology to eliminate the need for a setup compass swing or calibration and the EV-400 doesn t need to be adjusted to the boat in which it is installed. This innovative breakthrough in autopilot intelligence uses Evolution AiTM control algorithms that give the autopilot the ability to perceive its environment and instantly calculate and evolve steering commands for maximum performance. This results in precise course-keeping regardless of vessel speed or sea conditions. The EV-400 Sail Autopilot is designed for large sailboats and is compatible with Type 2 and Type 3 Raymarine hydraulic, linear and rotary mechanical drives. You purchase drive units separately depending on your boat s displacement and steering type. The system is easy to install and it works with the p70 control head. Setting up the EV-400 takes mere seconds. Select the large sailboat followed by the drive type hydraulic or mechanical and finally choose the performance level. The p70 offers one- and 10-degree course change push buttons for ease of use.