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ComNav Vector G2 & G2B Installation & Operation Introduction
Document PN 29010078 V2.0 - 14 -
DRAFT #3 – 29 May 2009
There are two models available – the Vector G2 and the Vector G2B; they are identical,
except in their Differential GPS (DGPS) correction features:
The Vector G2 can obtain DGPS information from many Space-Based
Augmentation System (SBAS) sources (in areas where compatible ones are
available & operational), including WAAS, EGNOS, MSAS, SNAS, GAGAN and
others. The Vector G2 can also accept DGPS information from an external data
source.
The Vector G2B has an additional integrated beacon receiver module, which
allows it to use conventional terrestrial DGPS Radiobeacon signals to obtain
DGPS information, in addition to SBAS sources & external DGPS data sources.
The Vector G2’s enclosure contains a Hemisphere GPS® Crescent® GPS/SBAS
receiver module
1
(containing twin GPS receivers, a single-axis gyro & a tilt sensor), dual
GPS antennas and a power supply. The Vector G2B also contains a DGPS
Radiobeacon receiver module, and an H-field beacon signals antenna.
When using DGPS corrections (SBAS, external, or Radiobeacon), the Vector G2 is
capable of one metre precision for position sensing. The GPS antennas inside the G2’s
enclosure are separated by 0.5 metres, which provides 0.5 degree precision for heading
sensing.
The gyro and tilt sensor improve system performance, and can provide heading
information for up to three minutes whenever the G2’s normal GPS-based heading is not
available due to signal blockage, or other temporary factors.
The Vector G2 also features Hemisphere’s exclusive COAST™ software, which enables
the GPS receiver to utilize old DGPS correction data for 40 minutes or more without
significantly affecting the quality of position reports. The COAST feature means that the
G2 is less likely to be affected by DGPS signal outages due to signal blockages, weak
signals or interference.
If you are new to GPS technology, we recommend that you consult Hemisphere’s
GPS Technical Reference manual
2
for further information on the capabilities & general
features of their Crescent-based GPS products, before proceeding.
Note: while the Vector G2 & G2B are designed to provide highly
accurate GPS position & heading data, even when subject to the
pitching, rolling and wide speed range of marine vessels, the use of
the G2s is not limited to the marine market.
Other excellent applications include machine control, machinery
guidance, container tracking, or indeed any application that
requires high-precision position and/or heading information in an
all-weather outdoor environment.
The Vector G2 is factory-configured for easy use in typical marine situations, such as
illustrated in Figure
1. The goal when the factory-default settings were being selected
was that the G2 could be used “right out of the box” in most marine applications, with no
changes required in configuration settings.
We hope that you will be able to do exactly that … use your new Vector G2 right out of
the box! But if not, then the information in this manual will show you how to adjust your
G2 to operate exactly how you want it to.
1
See Appendix 3 on page 89 for more details.
2
This manual can be found on the CD that is supplied with the unit, or on Hemisphere’s web site. ComNav’s Service
Department will also send it to you at no charge.
www.busse-yachtshop.de | info@busse-yachtshop.de
16


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