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                                        Garmin GMR 18 HD3 Radome Specifications
| General | |
| Dimension | 20″ diameter, 9.8″ high (508 mm diameter, 248 mm high) | 
|---|---|
| Weight | 7.0 kg | 
| Waterproof | IPX7 | 
| Antenna Length | 17″ (43 cm) | 
| Rotation speed (RPM) | 24 rpm | 
| Beam width | 5.2° horizontal, 25° vertical | 
| Maximum range | 36 nm | 
| Minimum range | 20 meters | 
| Radar type | Radome | 
| Electrical Features | |
| Power Input | 11-32 V DC | 
| Power Consumption (standby) | 15 W | 
| Typical power consumption, transmitting (normal mode) | 40 W | 
| Transmit power | 4 kW | 
| Radar Features | |
| Overlay | ✔ | 
| Dual radar support | ✔ | 
| Auto Gain | Dynamic | 
| MARPA target tracking | yes (requires heading sensor, sold separately) | 
In the Box:
- GMR 18 HD3 dome radar
- Power cable (15 m/49.21 ft)
- Network cable (15 m/49.21 ft)
- Mounting hardware kit and template
- Installation instructions
 
    