For boats with digital drive-by-wire steering that need an autopilot without extra hardware at the helm.
Amazon $2,999.99
For boats with Yamaha Helm Master steering.
- Steer-by-wireSteering
- NoDrive in pack
- YesNMEA 2000
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
- Made for Yamaha Helm Master joystick systems
- GHC 50 touchscreen included
- Works with a compatible Garmin chartplotter
- Useless without Yamaha Helm Master
- Listing publishes few specs
The Garmin Reactor 40 family
Every Garmin Reactor 40 model we rank, smallest first. Ratings compare each against its own steering type.
| Model | Steering | Rating | Price |
|---|---|---|---|
| Garmin Compact Reactor 40 Hydraulic, GHC 50 | Hydraulic | 3.1/5 | $1,799.99 |
| Garmin Reactor 40 Hydraulic Corepack, GHC 50 | Hydraulic | 3.2/5 | $4,399.99 |
| Garmin Reactor 40 Mechanical Corepack, GHC 50 | Mechanical | 3.2/5 | $2,249.99 |
| Garmin Reactor 40 Steer-by-Wire, GHC 50 | Steer-by-wire | 3.1/5 | $2,799.99 |
| Garmin Reactor 40 Yamaha Helm Master, GHC 50 (this one) | Steer-by-wire | 3.0/5 | $3,449.99 |
| Garmin Reactor 40 Kicker Autopilot, GHC 50 | Kicker motor | 3.3/5 | $2,999.99 |
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its steering type. How we rank explains each one.
Specifications
| Model number | 010-02794-04 |
|---|---|
| Capability | |
| Steering type | Steer-by-wire |
| Pack type | Core pack |
| In the pack | |
| Contents | Reactor 40 steer-by-wire corepack for Yamaha Helm Master with GHC 50 instrument |
| Control head | GHC 50 touchscreen |
| Control head included | Yes |
| Drive or pump included | No |
| Heading sensor | Solid-state 9-axis AHRS |
| Electrical | |
| Supply voltage | 12 V |
| NMEA 2000 / SeaTalk ng | Yes |
| Support | |
| Warranty | 1 year |
| Released | 2022-06 |
Alternatives in this steering type
For boats with generic steer-by-wire steering that want Garmin autopilot control.
Amazon $2,799.99For multi-engine outboard fishing boats that already have SeaStar Optimus 360 steering.
Amazon $2,695Compare
Compare the Garmin Reactor 40 Yamaha Helm Master, GHC 50 with any other marine autopilot →
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