ComNav P4 Installation and Operation System Overview
Document PN 29010100 V1r0 - 31 -
Compasses
The Compass is a critical component in the proper operation of the P4 Autopilot System. The
autopilot system’s ability to steer the vessel to a given Heading desired by the Operator can
only be as accurate as the Compass.
The P4 system is capable of using a variety of different compasses. These are discussed
below. Various combinations of these compasses, and related accessories, are often
required.
Note: It is always a wise and safe choice to have at least two compasses,
and/or other Heading sensing devices, on board.
GNSS G2 and G2B GPS Compasses
PN 11220008 (G1) – NMEA2000 model
PN 11220005 or PN 11220009 NMEA 0183 15m or 30m cable
PN 11220006 G2 NMEA 2000 model
PN 11220001 or 11220002 (G2) – NMEA0183 model with 15 or 30 metre cable
PN 11220003 or 11220004 (G2B) – NMEA0183 model with 15 or 30 metre cable
The ComNav GPS Compasses are state-of-the-art devices which can provide
accurate 2D Heading and Position data to autopilots, sonar, chart-plotters, AIS
transponders,
and other NMEA 0183 and NMEA2000 devices.
Figure 6 – GNSS G2 GPS Compass
Built-in DGPS processing capability provides sub-meter Position accuracy. DGPS source
options in the G2 and G2B include standard SBAS systems (WAAS, EGNOS, MSAS,
GAGAN,
etc.), and external RTCM SC-104; the G2B can also use terrestrial DGPS
Radiobeacon
signals (IEC 61108-4), via an internal Beacon receiver module.
The GNSS compass features fast start up times, Heading and Position updates at up to
20 Hz, and will
work correctly at sustained turn rates up to 90° per second.
The GNSS compass comes with a choice of mounting styles: a flat-surface base, a pole-
mount
base and bracket mount. The entire unit is fully waterproof. The GNSS NMEA
N2K/0183 compass provides dual, independently
configurable, NMEA 0183 data outputs,
each available at both the NMEA 0183 Standard’s
output voltages, and at PC-friendly
“COM port” voltages. The GNSS NMEA2000 provides Heading, Altitude, Pitch, Roll,
Position, Turn Rate , Local and UTC time, Magnetic Variation NMEA2000 output data. It is
possible to be configurable, but is not available currently.
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