HEALY is outfitted with Sperry Marine's Voyage Management
System (VMS). This system utilizes multiple heading,
position, environmental, and navigation inputs to steer
the ship along a desired course. Currently, HEALY has
the following GPS receivers: GPS, DGPS, P-Code GPS,
and 3-D GPS. Heading inputs include two gyrocompasses
and the 3-D GPS heading information. The ship is also
outfitted with an electronic magnetic compass.
A Dynamic Positioning System (DPS) is available for
station keeping and slow speed transits (towing, dredging).
HEALY's DPS attempts to do with props and a bowthruster
what smaller ships do with fore and aft thrusters, so
it has limitations. It was designed and built by ALSTOM
and integrates the use of propellers, rudders, and the
bow thruster to accomplish ship movement.
DPS Limitations: At best heading in openwater, in a
20 kt wind, seas with a significant wave height of 4.0
feet and a 1 knot currents, HEALY shall be capable of
maintaining a position of +/- 150 feet or 3% of water
depth (whichever is greater) from a point or trackline
and maintain a heading of +/- 5 degrees. The seas and
wind shall be from the same direction, with the current
from less the 45 degrees off the wind.
Also See
Antenna
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