 
 
 Comnav G1 GNSS Satellite Compass with 6m Cable, NMEA2000
  
Accurate Heading, Position, 
and Rate of Turn 
•  
Small compact all-in-one maintenance free unit
•  
Fully compatible with NMEA 2000 or 0183 equipment:
Autopilots, Radar, AIS, Plotters, etc. 
•  
Accurate 2D heading and positioning data
•  
Better than 0.60 degree Heading accuracy
•  90º 
Rate of Turn tracking (ROT)
•  
Provides Heave, Pitch and Roll information
•  DGPS 
provides sub-meter positioning accuracy
•  
Differential Correction source SBAS (WAAS, EGNOS
and MSAS) and RTCM SC-104 data (External Source) 
•  
COASTTM technology maintains differentially-corrected position for
40 minutes or more with loss of differential signal 
•  
Integrated Gyro & Tilt sensors provide fast start up times and
Heading updates during temporary loss of GPS 
•  20 
Hz position and Heading update rates (10Hz standard)
•  
Multiple BAUD rate selections
•  CE 
certified for EMI and RFI immunity
•  
Pre-programmed default settings for Heading, Rate of Turn,
Course over Ground, Lat/Long Geographic position, Time & Date 
•  
Optional color display
•  2 
year warranty
•  World wide 
service
SPECIFICATIONS: 
Receiver Type:  
L1, C/A code, with carrier phase 
smoothing
Channels:  
Two 12-channel parallel tracking
(Two 10 channel when tracking SBAS) 
SBAS Tracking:  
2- channel parallel tracking
Update Rate:  
Standard 10Hz, optional 20 Hz
(position and heading) 
Horizontal Accuracy:  
< 1.0m (DGPS)*
< 4.0m (autonomous, no SBAS)** 
Heading Accuracy:  
≈ 
0.6º
Pitch / Roll Accuracy:  
≈ 
1.4º
Heave Accuracy:  
< 30cm
Rate of Turn:  
90º / sec max
Start-up Time:  
< 60 sec typical
Heading Fix:  
< 10 sec
Satellite Reacquisition:  
< 1 sec
COMMUNICATIONS 
Serial Ports:  
2 full duplex RS-232
Baud Rates:  
4800 - 115200
Correction I/O Protocol:  
RTCM SC-104
Data I/O Protocol:  
NMEA 0183, NMEA 2000
NMEA Heading Messages:  
$GPHDT, $HEHDT, $HEHDM, $GPROT,
$GHEROT, $GPGGA, $GPGSV, $GPVTG, 
$GPRMC, $GPZDA, $PASHR 
ENVIRONMENTAL 
Operating Temperature:  
-30ºC to +70ºC (-22ºF to + 158ºF)
Storage Temperature:  
-40ºC to +85ºC (-40ºF to + 185ºF)
Humidity:  
95% non-condensing
EMC:  
FCC Part 1.5, Subpart B, Class B, CISPR22, CE
POWER 
Input Voltage:  
10 to 36 VDC
Power Consumption:  
< 3 W nominal
Current Consumption:  
< 250 mA @ 12 VDC
Power Isolation:  
Isolated to enclosure
Reverse Polarity Protection:  
Yes
Power/Data Connection:  
12-pin, Female, R/A, IP67
AIDING DEVICES 
Gyro:  
Provides reliable < 1º Heading for up to 3
minutes when loss of GPS has occurred 
Tilt Sensor:  
Assists in fast start-up of 
heading solution
* Depends on multipath environment, antenna selection, 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 
DIMENSIONS:  
417mm x 67mm x 158mm / 16.4” x 
2.7” x 6.2“ L x H x W
WEIGHT:  1.5 kg (3.3 
lb)
 
Download Acrobat Document: 
 
WEB_GNSS_G1_Rev_May_2015.pdf –  
235.7 KB 
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