Wesmar HD800/110-10, Installation & Operation Manual

Page: 38 / 100

Page 38
WESMAR
HD800
TION
Part B will outline where to locate your seachest,
and what size seachest you should obtain for your
model of sonar. For fiberglass boats, you can order
a fiberglass seachest from WESMAR. Seachests for
wooden, steel, or aluminum boats are constructed at
the shipyard, according to the specifications given in
the following pages.
1.0 SEACHEST LOCATION
For vessels of 150 tons or more, the seachest should
be installed 1/10 to 1/5 of the ship’s overall length
back from the bow.
On vessels of 50 to 150 tons, the seachest should be
installed 1/5 to 1/3 of the ship’s overall length
back from the bow.
With smaller vessels up to 50 tons, the seachest
should be installed 1/3 to 1/2 of the ship’s overall
length back from the bow.
Mounting the seachest too far forward will expose
the soundome to turbulence and air bubbles. In-
stalling the seachest too far aft will place the soun-
dome close to the engine and propeller. They are
sources of noise and can limit sonar performance.
Locate the seachest away from water intakes, discharge
lines, or zinc plates welded to the hull.
Air bubbles and water turbulence caused by these
objects during vessel movement will reduce sonar
performance.
Avoid installing the seachest in the vicinity of exist-
ing transducers.
Sounders and other sonar equipment, when oper-
ated at the same time, may interfere and cause a
pattern to appear on the HD800 display screen
each time they transmit.
Install the seachest next to the keel.
A seachest installed too far from the keel will have
THE SEACHEST IS NORMALLY INSTALLED ABOUT
1/3 OF THE WAY BACK FROM THE BOW.
Special Circumstances:
On seining boats, install the seachest
on the same side of the vessel used for
setting the net.
The soundome can then scan the net
without being blocked by the keel
when the vessel rolls.
For engine room installations, place
the seachest forward of the engine.
This will eliminate possible me-
chanical vibration and electrical
interference.
For fish hold installations, a watertight
box must be built around the complete
soundome assembly.
Fit a drain plug to the bottom of this
box to provide drainage. A lamp
or some kind of heat source is also
recommended.
NOTE: This is generally not a safe
location for the hoist assembly.