Transducers; Accessories; Installation And Setup; Installation - Navman MULTI 3100 Installation And Operation Manual

9-3 Transducers

The MULTI 3100 is usually used with a through hull
depth transducer and a separate through hull speed/
temperature transducer. However, the unit can take
readings from another instrument, in which case it
may not need transducers (see section 8).
Through hull transducers generally give the best
performance and are the best choice for
displacement hulls. They are mounted in a hole
drilled through the bottom of the boat.
Plastic through hull transducers are suitable
for GRP or metal hulls.
Bronze transducers are suitable for wood or
fibreglass hulls. Never install a bronze
transducer in a metal hull, because it will
cause electrolytic corrosion.
A range of NAVMAN through hull transducers are
available, plus in hull and transom mount
transducers. For more information, refer to the

9-4 Accessories

These accessories are available from your NAVMAN dealer.
4 m speed
transducer extension
cable

10 Installation and setup

Correct installation is critical to the performance of
the unit. It is vital to read this section of the manual
and the documentation that comes with the other
parts before starting installation.
The MULTI 3100 can:
Drive external beepers or lights for the alarm
and countdown timer.
Send and receive data from other NAVMAN
instruments connected via NavBus. Settings
for alarms, units, calibration and backlighting
are shared (see section 8).
Send and receive NMEA data from other
instruments.
Warnings
The unit is waterproof from the front. Protect the rear
of the unit from water, or else water might enter the
breathing hole and damage the unit. The warranty
does not cover damage caused by moisture or water
entering the back of the unit.
MULTI 3100 Installation and Operation Manual
4 m depth
transducer speed transducer
extension cable
Transducer Installation manual or consult your
NAVMAN dealer.
Through hull Through hull speed
skin fitting
The choice, location, angle and installation of
the transducers is the most critical part of the
installation. If they are not correct, the unit can
not perform at its designed potential. If in
doubt, consult your NAVMAN dealer. Plastic
through hull transducers are usually unsuitable
for wood hulls. If in doubt, consult a marine
surveyor or marine engineer.
Ensure that any holes that you cut will not weaken
the boat's structure. If in doubt, consult a qualified
boat builder.

10-1 Installation

MULTI 3100 display unit
1 Choose a location for the display unit that is:
Easily seen and protected from damage.
At least 100 mm (4") from a compass and
at least 500 mm (19.5") from a radio or
radar antenna.
NavBus junction
paddlewheel Box (See section 8)
13