ComNav | G2/G2B GNSS Satellite Compass - NMEA 0183
ComNav | G2/G2B GNSS Satellite Compass - NMEA 0183
The ComNav G2/G2B GNSS Satellite Compass delivers industry-leading heading and positioning accuracy for commercial and professional marine navigation. Featuring dual GNSS antennas and advanced signal processing, it provides stable heading, position, pitch, and roll data even in challenging conditions. Fully compatible with NMEA 0183 systems, the G2/G2B ensures reliable integration with radar, autopilot, sonar, and other navigation equipment for enhanced onboard performance and safety.
KEY FEATURES
- New: Supports both GPS and GLONASS satellites for complete redundancy
- New: Heading accuracy < 0.25° rms
- New: Position accuracy < 0.3 m (95% confidence, DGPS)
- New: Integrated 9-Axis Inertial Measurement Core (IMC technology) provides enhanced roll, tilt, and heading stability even during momentary loss of satellite signals
- New: IMO Compliant G3 color display system (optional)
- New: Engineered enhancements to exceed sealed IP67 rating
- New: Extended 2-year warranty
- NMEA 0183 and NMEA 2000® interface
- Heave, Pitch, Roll, and Rate of Turn as standard outputs
- Heading updates from 1 to 20 Hz
- BAUD rate selectable: 4800, 9600, 19200, 38400, 115200
- Fully compatible with onboard NMEA 0183 and NMEA 2000® RADAR, ECDIS, AIS, cameras, SONAR, PC, and autopilots
- Compact integrated surface mounting (pole mount optional)
- IMO Compliant, Wheelmark, and USCG approved
- Pre-programmed default settings for Heading, Rate of Turn, Course Over Ground, Latitude/Longitude position, Time, and Date
- 1PPS output standard
- 15-meter serial cable standard (30-meter optional)
- 6-meter NMEA 2000® cable (optional)
- CE certified for EMI and RFI immunity
- Worldwide service
Specifications
| Category | Detail |
|---|---|
| Receiver Type | L1, C/A code, with carrier phase smoothing |
| Channels | Two × 32 parallel tracking GPS, GLONASS, SBAS |
| Update Rate | Standard 10 Hz, selectable up to 20 Hz (position and heading) |
| Horizontal Accuracy | < 0.3 m (95% confidence, DGPS)* < 2.5 m (95% confidence, autonomous, no SA)** |
| Heading Accuracy | < 0.25° rms |
| Pitch / Roll Accuracy | < 1° rms |
| Heave Accuracy | < 30 cm rms |
| Rate of Turn | 45°/sec max |
| Start-up Time | < 60 sec typical |
| Heading Fix | < 10 sec |
| Satellite Reacquisition | < 1 sec |
| Timing Output | 1PPS, 50 ns accuracy, CMOS |
System Configuration & Options
| Parameter | Detail |
|---|---|
| Operating Voltage | 10–36 VDC |
| Additional Options | - 30 m NMEA 0183 Serial Data Cable - 6 m NMEA 2000® Cable (not IMO compliant) - Color LCD Sunlight G3 Instrument Display |
Beacon Receiver Details (G2B)
| Parameter | Details |
|---|---|
| Channels | 2-channel, parallel tracking |
| Frequency Range | 283.5 to 325 kHz |
| Operating Modes | Automatic (signal strength or range) and manual |
| Compliance | IEC 61108-4 Beacon Standard |
Communications
| Parameter | Details |
|---|---|
| Serial Ports | 1 full-duplex RS-232 and 1 full-duplex RS-422 |
| Baud Rates | Selectable 4800 – 115200 |
| Correction I/O Protocol | RTCM v2.3 (DGPS), RTCM SC-104 |
| Data I/O Protocol | NMEA 0183, NMEA 2000®, Proprietary ASCII |
| Heading Warning I/O | Open relay system indicates invalid heading |
| NMEA Heading Messages | $GPHDT, $GPROT, $PSAT, $GPHDM, $GPHDG |
| Timing Output | 1PPS CMOS, active low, 10KΩ, 10pF load |
Environmental
| Parameter | Details |
|---|---|
| Operating Temperature | -32°C to +74°C (-25°F to +165°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Humidity | 0–99% non-condensing |
Power
| Parameter | Details |
|---|---|
| Input Voltage | 10–36 VDC |
| Power Consumption | ~3 W nominal |
| Current Consumption | ~250 mA @ 12 VDC |
| Isolation | Power supply isolated from serial ports |
| Reverse Polarity Protection | Yes |
Mechanical
| Parameter | Details |
|---|---|
| Weight | G2: 2.2 kg (4.8 lb) G2B: 2.7 kg (5.9 lb) |
| Power/Data Connection | 18-pin female circular, IP67 sealed cable |
Aiding Devices
| Device | Details |
|---|---|
| Gyro | Provides smooth heading, fast heading reacquisition, and reliable < 1° heading for up to 3 minutes during GPS loss (static conditions) |
| Tilt Sensor | Assists in fast start-up of heading solutions |
Notes
* Accuracy depends on multipath environment, number of satellites in view, satellite geometry, baseline length (for local services), and ionospheric activity.
** Accuracy depends on multipath environment, number of satellites in view, and satellite geometry.
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