Hemisphere GPS Crescent V100 Series, User Manual

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Crescent V100 Series User Guide
7
The second method of mounting the Crescent V100 system is to
mount the Crescent V100 perpendicular to the boat’s symmetrical
axis. This orientation will provide the heading and roll of the vessel.
The Crescent V100 is then configured with a heading bias of +90
°
or -90°, depending if the
Crescent V100
points to port or starboard,
to correct the heading.
A feature is present in the Crescent V100 to change the sign of the
roll/pitch measurement to be positive or negative, depending on
the required conversion for positive/negative roll, if needed.
Consult Hemisphere GPS’ GPS Technical Reference manual for
further information.
Crescent V100 Alignment
The top of the Crescent V100 enclosure incorporates a pair of sight
design features for assisting antenna alignment. The sights will
help you to align the enclosure with respect to an important feature
on your vessel. (See Figure 1-1 and Figure 1-2 on page 7 and page
8.)
To use the sights, center the small post on the opposite side of the
enclosure from you, within the channel made in the medallion
located in the center of the enclosure top as shown in the two
following figures. Alignment accuracy when looking through the
long site is approxi/- 1
°. Using the short site alignment is
approximately accurate to +/-
2.5
°.
Figure 1-1. Lining up the alignment sight