The Garmin Reactor™ 40 Steer-by-Wire Corepack for Viking® VIPER™ Without GHC™ Autopilot Instrument (010-00705-92) provides automated course control designed specifically for vessels equipped with the Viking Independent Programmable Electro-hydraulic Rudder (VIPER™) steering system. Engineered for helm setups featuring existing compatible Garmin GPSMAP® chartplotters or dedicated control displays, this corepack establishes a direct electronic link to the VIPER™ network via a specialized software gateway, eliminating the need for an external hydraulic pump. At its core, a solid-state 9-axis Attitude and Heading Reference System (AHRS) continuously compensates for pitch, roll, and yaw, maintaining accurate heading hold and reducing rudder movement in rough sea conditions. With NMEA 2000® connectivity, the system integrates into the vessel’s network, enabling full autopilot operation, step turns, route following, and Auto Guidance features directly through compatible multifunction displays.