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Garmin Reactor™ 40 Steer-by-wire Corepack for Yamaha® Helm Master® with GHC™ 20 (010-00705-87) is a dedicated electronic autopilot system designed for boats with Yamaha Helm Master steering. Powered by a 9-axis AHRS CCU, it connects directly to Yamaha’s digital network via an included gateway—requiring no external hydraulic pumps. It features the 4-inch GHC™ 20 button-controlled display and connects via NMEA 2000® for seamless MFD integration.
| Feature / Parameter | Specification |
| Physical Dimensions (W x H x D) | 4.3″ x 4.4″ x 1.9″ (109 x 112 x 48 mm) |
| Display Size & Type | 4.0″ diagonal, QVGA color LCD display with glass-bonded lens |
| Display Resolution | 320 x 240 pixels |
| Weight | 8.7 oz (247 g) |
| Water Rating | IPX7 (waterproof up to 1m depth for 30 min) |
| Display Brightness / View Angle | 1,200 cd/m² (nit) / 170° viewing angle |
| Supply Voltage | Powered via NMEA 2000® network (9V to 16V DC; operates up to 32V DC) |
| Power Consumption | Max 3 W |
| NMEA 2000 LEN | 7 (350 mA at 9 VDC) |
| Control Interface | Soft-key push buttons + ANT+® wireless for remote/smartwatch control |
| Feature / Parameter | Specification |
| Garmin Part Number (MPN) | 010-00705-87 |
| Physical Dimensions | 3 19/32″ diameter (91.4 mm) |
| Weight | 5.6 oz (159 g) |
| Sensor Type | Solid-state 9-axis AHRS (Attitude Heading Reference System) |
| Case Material | Fully gasketed, high-impact plastic |
| Water Rating | IEC 60529 IPX7 |
| Operating Temperature | -15°C to 55°C (5°F to 131°F) |
| NMEA 2000 Supply Voltage | 9V to 16V DC |
| NMEA 2000 LEN | 3 (150 mA) |
| CCU Cable Length | 9.5 ft (3 m) |
| Parameter | Specification |
| Dimensions (L x W x H) | 5 1/8″ x 2 3/8″ x 1″ (130 x 60 x 25 mm) |
| Weight | Less than 1 oz (28 g) |
| Function | Translates digital CAN-bus commands between Garmin CCU and Yamaha Helm Master™ network |
| Steering System Compatibility | Legacy Yamaha® Helm Master™ systems (Not compatible with Helm Master EX®) |
| Parameter / Item | Specification / Details |
| Buzzer Dimensions (L x Dia.) | 29/32″ x 1″ (23 x 25 mm) |
| Buzzer Weight & Cable | 2.4 oz (68 g); 10 ft (3.0 m) cable length |
| Network Accessories | NMEA 2000® drop cables (2 m), power cable (2 m), 3x T-connectors, male & female terminators |
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