Operating instructions

4H2: Electronics: Depth Sounder & Knotmeter/Log - Datamarine
There is a Datamarine digital depth sounder and
speed log system on the flybridge, with repeaters at the
lower helm, showing depth BELOW THE KEEL and speed
in knots, trip mileage in nautical miles, etc. Operation of
this system is described in its operating manual, but it is
quite simple and intuitive.
They are turned on by the breaker in the DC power
panel.
Because our waters are sometimes very
deep, the depth sounders will not display
or will stay on a high depth reading when
the water’s depth is beyond its capacity.
Remember when backing up, or crossing a “tide
line”, that turbulent water from the tides or
boat’s screws (or those of another boat) can
interrupt the sounding information received by
the unit. Be careful!
Note that our Northwest waters are rocky and
depths change rapidly. You should be
especially careful to study your charts, and then
check them often whenever running in depths
of 50 feet or less, so that you don’t hit a rock!
Just as our islands “pop up” to heights of 50,
100, or even thousands of feet in a very small
horizontal distance, so do rocky obstacles!
4H3: Electronics: Depth Sounder - Furuno FCV-620 Fishfinders
This unit is at the lower helm; a duplicate is at the
upper helm. Operation is simple, with full details in the
operating manual.
Datamarine Dart System on F/B.
At lower helm: Sounder & .Speed Log.
Section 4H: Electronics 4.20