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531474-1_A_777c2_English.qxd
11/3/2005
Finding the Cause of Noise
Electrical noise usually affects the display with many black dots at high speeds, and
high sensitivity readings. One or more of the following sources can cause noise or
interference:
Possible Source of Noise
Isolation
Other electronic devices
Turn off any nearby electronic devices to see if the
problem goes away, then turn them on one at a
time to see if the noise re-appears.
The boat's engine
To determine whether the boat's engine is the
source of the noise, increase the RPMs while the
boat is in neutral and stationary to see if the noise
increases proportionately; if noise appears when
you rev the engine, the problem could be the spark
plugs, alternator, or tachometer wiring. Replace the
spark plugs with resistor plugs, install an alternator
filter, or route the control head power and
transducer cables away from the engine wiring.
Cavitation from the boat's
Turbulence created by the propeller can cause
propeller
noise; make sure the transducer is mounted at least
15" (38 cm) from the propeller, and that the water
flows smoothly over the face of the transducer at
all times.
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700 Series™ Fishing System Accessories
Accessories customize the 700 Series™ Fishing System to your needs and enable you
to stay on the edge of new technology. When an accessory is connected to the 700
Series™ Fishing System, additional menus and readouts are added automatically to
the Main Menu System. Accessories available today that are supported by your
Fishing System include:
WideSide® transducer: purchase and connect the WideSide® transducer to your 700
Series™ Fishing System to access specialized "side looking" functions that are
extremely useful for bank fishing or looking for bait fish in open water.
QuadraBeam™ transducer: purchase and connect the QuadraBeam™ transducer to
your 700 Series™ Fishing System to access specialized QuadraBeam™ functions such
as two 45° 455 kHz beams for a continuous 90° of uninterrupted side to side
coverage to 160 feet. These Side Structure locating beams reveal fish and structure
to the left and right of your boat near the bottom.
Temperature/Speed: purchase and plug in the Temperature/Speed accessory to
your 700 Series™ control head to get real time speed and temperature readouts, as
well as a valuable Triplog function.
NOTE: If an external Temperature/Speed (TS-W) or Temperature (TG-W) accessory is
connected AND a transducer with temperature built in is connected at the same time, the
TS-W or TG-W accessory will override the temperature which is built in to the transducer.
WeatherSense® Fishing Condition Monitor: purchase and plug in the
WeatherSense® accessory to your 700 Series™ Fishing System to obtain barometric
pressure readouts and trend data in real time.
GR16 GPS Receivers: purchase and connect the GR16 GPS Receiver to your 700
Series™ Fishing System to access advanced FishingGPS™, trackplotter and navigation
capabilities built-in to your Fishing System.
GPS Connection Cable: purchase the GPS Connection Cable in order to connect a
handheld or other NMEA* GPS-compatible device that you may already own to your
700 Series™ Fishing System.
*NMEA 0183 is a National Marine Electronics Association standard for data communication.
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