The Garmin Reactor™ 40 Steer-by-wire Corepack for Viking® VIPER™ with GHC™ 20 Autopilot Instrument (PN: 010-00705-88) is a specialized marine autopilot system designed to integrate directly with Viking yachts featuring the Viking VIPER (Viking Independent Power Electronic Rudder) steering platform. Driven by an advanced solid-state 9-axis Attitude Heading Reference System (AHRS), the unit allows for versatile mounting orientations while actively correcting for pitch and roll to minimize heading drift, course errors, and unnecessary rudder movements. This complete package includes the dedicated GHC™ 20 helm control display—a bright, 4-inch glass-bonded QVGA color screen offering a wide 170-degree viewing angle and high-contrast color schemes for optimal readability in both direct sunlight and low-light environments. Connected over an NMEA 2000® network, the system enables quick commissioning and allows full autopilot operation—including heading hold, step turns, wind hold, and Auto Guidance+™ routing—directly from the GHC 20 unit or networked compatible Garmin chartplotters, while sharing precise heading data across onboard radar overlays and chart displays.
In the Box
- Reactor 40 CCU (Course Computer Unit)
- GHC™ 20 helm control display
- CCU cable
- Buzzer
- NMEA 2000® drop cables (2 meters)
- NMEA 2000 power cable
- NMEA 2000 T-connectors
- Male and female terminators
- Documentation


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