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ComNav Admiral P3 Installation & Operation System Overview
Document PN 29010075 V3.1 - 26 -
Compasses
The Compass is a critical component in the proper operation of the Admiral P3 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 Admiral P3 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.
It is always a wise and safe choice to have at least two compasses,
and/or other Heading sensing devices, on board!
Vector G2 and G2B GPS Compasses
PN 11210001 (G2)
PN 11210004 (G2B)
The ComNav Vector GPS Compasses are state-of-the-art devices which provide accurate 2D
Heading & Position data to autopilots, sonar, chartplotters AIS transponders, and other
NMEA 0183 devices.
Figure 6 – Vector G2 GPS Compass
Built-in DGPS processing capability provides sub-meter Position accuracy. DGPS source
options in the G2 & G2B include standard SBAS systems (WAAS, EGNOS, MSAS, 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 Vectors feature fast start up times (< 1 minute), heading updates up to 20 times per
second, and continue to work correctly at sustained turn rates up to 90° per second.
The Vectors come with a choice of mounting styles: a flat-surface base, or a pole-mount
base. The entire unit is fully waterproof. The Vectors provide dual, independently
configurable, NMEA 0183 data outputs, each available at both NMEA 0183 standard output
voltages, and PC-friendly serial “COM port” voltages.
One feature of the Vectors is especially useful in marine applications: Heading is determined
by mathematical computation, directly from the RF signals from the GPS satellites, rather
than sensing the Earth’s magnetic field – and thus there are no local magnetic deviation
effects from metal objects, electrical devices & wiring, and so on.
The Vectors contain a solid-state Gyro sensor, which is used to provide Heading data in
situations where GPS signal reception is subject to transient interference. A Tilt sensor
measures the vessel’s Pitch (or Roll, depending on which way the unit is mounted), and the
data is used to remove any effects of Pitch/Roll on the Heading computation.
The Vector is connected to the Admiral P3 at one of the SPU’s two NMEA Input ports. The
standard cable length is 15 metres (50’); 30 metres (100’) is also available.
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