G2 & G2B GNSS Satellite Compasses


Accurate Heading and

Precise Position for


G2 and G2B

GNSS Satellite Compass

New: Supports both GPS and GLONASS satellites for complete redundancy

New: Heading accuracy < 0.25° rms

New: Position accuracy < 0.3m 95% confidence (DGPS)

New: An 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 output

Heading updates 1 to 20 Hz

BAUD Rate selectable: 4800, 9600, 19200, 38400,115200

Fully compatible with on board 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, Lat/Long position, Time & 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

G2 and G2B



Receiver Type:

L1, C/A code, with carrier phase smoothing


Two x 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:

< 0.25º rms

Pitch / Roll Accuracy:

< 1º rms

Heave Accuracy:

< 30 cm rms

Rate of Turn:

45º / sec max

Start-up Time:

< 60 sec typical

Heading Fix:

< 10 sec

Satellite Reacquisition:

< 1 sec

Timing Output:

1PPS, 50 ns accuracy, CMOS



2-channel, parallel tracking

Frequency Range:

283.5 to 325 kHz

Operating Modes:

Automatic (signal strength or range) and manual


IEC 61108-4 Beacon Standard


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:


Timing Output:

1PPS CMOS, active low, 10KΩ, 10pF load


Operating Temperature:

-32ºC to +74ºC (-25ºF to + 165ºF)

Storage Temperature:

-40ºC to +85ºC (-40ºF to + 185ºF)


0 - 99% non-condensing


Input Voltage:

10 to 36 VDC

Power Consumption:

~ 3 W nominal

Current Consumption:

~ 250 mA @ 12 VDC


Power supply isolated from serial ports

Reverse Polarity Protect:



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

10 - 36VDC

DIMENSIONS: 669.8mm x 122mm x 212.7mm / 26.37” x 4.80” x 8.37“ LxHxW

WEIGHT: G2: 2.2 kg (4.8 lb) / G2B: 2.7 kg (5.9 lb)



Provides smooth heading, fast heading reacquisition


and reliable < 1º heading for periods up to 3 minutes


when loss of GPS has occured (static conditions)

Tilt Sensor:

Assists in fast start up of heading solutions

*Depends on multipath environment, number of satellites in view, satellite geometry, baseline length (for local services), and Ionospheric activity.

**Depends on multipath environment, number of satellites in view, and satellite geometry.

ComNav Marine Ltd.

#15-13511 Crestwood Place,

Richmond, British Columbia • Canada • V6V 2G1

Phone: 604-207-1600 • Fax: 604-207-8008

E-mail: sales@comnav.com


Worldwide Service

Printed in Canada


30m NMEA 0183 Serial Data Cable

6m NMEA 2000® Cable (not IMO compliant)

Color LCD Sunlight G3 Instrument Display

Represented by:

Specifications subject to change without notice

Rev: May 2015

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