Humminbird Single Beam 105SX User manual

®
Operations Manual

THANK YOU
Thank you for choosing Humminbird, America’s #1 name
in fishfinders. Humminbird has built its reputation by
designing and manufacturing top-quality, thoroughly
reliable marine equipment. Your Humminbird is designed
for trouble-free use in even the harshest marine
environment.
In the unlikely event that your Humminbird does require
repairs, we offer an exclusive Service Guarantee - free of
charge during the first year after purchase, and available at
a reasonable rate after the one-year period. Complete
details are included at the end of this manual.
We encourage you to read this operations manual carefully
in order to get full benefit from all the features and uses of
your Humminbird product. Also, to register your purchase
and help us learn more about you, please fill out the
warranty registration card at the back of this manual.
WARNING! This device should not be used as a
navigational aid to prevent collision, grounding,
boat damage, or personal injury. When the boat is
moving, water depth may change too quickly to
allow time for you to react. Always operate the boat
at very slow speeds if you suspect shallow water or
submerged objects.
WARNING: Dis-assembly and repair of this electronic unit should only be performed
by authorized service personal. Any modification of the serial number or attempt to
repair the original equipment or accessories by unauthorized individuals will void the
warranty. handling and/or opening this unit may result in exposure to lead, in the form
of solder.
Warning: This product contains lead, a chemical known to the State of
California to cause cancer and birth defects and other reproductive harm.

Section 1: INSTALLATION PREPARATION . . . . . . . . . . . . . . . 2
Parts Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . 2
Alternative Transducers and Mounting Methods. . . . . . 4
Transducer Exchange . . . . . . . . . . . . . . . . . . . . . . . . . 5
Beginning Installation . . . . . . . . . . . . . . . . . . . . . . . . . 5
Section 2: USING THE 105SX. . . . . . . . . . . . . . . . . . . . . . . 6
How Sonar Works . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Simulator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 7
What You See On Screen . . . . . . . . . . . . . . . . . . . . . . 8
Control Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Menu Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Section 3: ADVANCED FEATURES. . . . . . . . . . . . . . . . . . . 21
Using the Diagnostic Feature. . . . . . . . . . . . . . . . . . . 21
Section 5: MAINTENANCE AND WARRANTY. . . . . . . . . . . 22
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Service Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Customer Resource Center . . . . . . . . . . . . . . . . . . . . 28
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
TABLE OF CONTENTS
P/N 531082-1 R11012E

2
INSTALLATION PREPARATION
PARTS SUPPLIED
PARTS SUPPLIED
Before installing your 105SX, please ensure the following parts are
included in the box:
• 105SX fishfinder
• Transducer with 20' (6m) of cable and mounting hardware kit
• Mounting system and mounting hardware kit
• 6' (2m) power cable
• Publications kit
• Temperature Probe
If any of these items is missing, call our Customer Support Hotline.
ACCESSORIES
Humminbird offers a wide assortment of accessories that complement
and expand the capability of your new 105SX. These accessories are
designed with the same high standards and are backed by the same one-
year warranty. The Humminbird Accessory catalog included with your unit
contains descriptions of the many accessories available and ordering
information. All Humminbird accessories are available through your full-
service Humminbird dealer or factory direct through our number listed in
the Customer Support section.
INSTALLATION OVERVIEW
The 105SX consists of two primary components to install: the control
head and the transducer.
The control head contains the sonar transmit and receive circuitry, as well
as the user controls and display. It should be installed in a location that
provides access to the controls and visibility while in use. The control
head mounts on a quick disconnect mounting system that swivels and
tilts providing flexibility for viewing from almost anywhere on the boat.
The transducer converts electrical energy from the transmitter into
mechanical pulses or sound waves. The transducer also receives the
reflected sound waves and converts them back into electrical signals for
display on the control head. It should be installed in contact with the

3
INSTALLATION PREPARATION
INSTALLATION OVERVIEW
surface of the water in an area that has smooth water flow - usually on
the transom of the boat. There are several mounting options for the
transducer. Review the following section to determine the method that
works for you and your boat.
Determining How to Mount the Transducer
The 105SX includes a model XHS- 6-24 transducer. This transducer can be
mounted on the transom of the boat, or bonded to the inside of a
fiberglass hull boat.
The transom installation, which is the
most widely used, places the
transducer on the outside of the boat
hull. This technique produces the least
signal loss, and provides a way to
adjust the transducer after installation.
As an alternative to transom mounting,
it is possible on many fiberglass-hulled
boats to glue the transducer on the
inside of the boat hull. Since fiberglass
has similar sonar characteristics as
water, the sonar signal can pass through the boat hull with minimal loss.
The hull of the boat must be single layer construction (not double-hulled).
Also, any air trapped in the lamination of the fiberglass would prevent the
sonar signal from passing through.
Inside the hull installations require
no holes be drilled into the boat and
through experimentation, high-
speed operation comparable to
transom mounting can be achieved.
Two part, slow cure epoxy (not
included) is required to glue the
transducer in place.
Transom Mounted Transducer
Inside the Hull Mounted Transducer

4
ALTERNATE TRANSDUCERS AND MOUNTING METHODS
The 105SX comes with everything necessary for installation and operation
on most boats. However, there are several situations which may require a
different type of transducer. Inboard boats, wood or metal hulls, and sail
boats create unique transducer mounting needs. Alternate transducers
and mounting methods are detailed below.
Portable Mounting
The standard transducer can be adapted for portable installations using
part number
MHX-SPT. This accessory adapts your transducer to a suction cup mount
for temporary installation on the boat hull or other surface.
Trolling Motor Mounting
The standard transducer can also be adapted
to mount on most trolling motors using part
number AD-STM. This accessory includes a
bracket and hose clamp that allows
mounting the transducer to the body of
most trolling motors.
Thru-Hull Mounting
Thru-hull transducers install through a hole
drilled in the hull of the boat. Larger boats or
boats with inboard motors create turbulence
that make transom mounting ineffective. Also,
hulls that are very thick or are double layered,
or made from materials such as wood or
metal, (which do not conduct sonar signals)
make inside the hull mounting inadvisable.
Thru-hull mounting may require the use of a
fairing block to level the transducer with the
waterline. Also, since special tools and
knowledge may be required to perform this
type of installation it is best to refer to a
qualified marine technician.
INSTALLATION PREPARATION
ALTERNATE TRANSDUCERS AND MOUNTING METHODS

TRANSDUCER EXCHANGE
Other transducers are available as replacements for the standard
transducer. You may exchange your new and unassembled transducer for
another type by returning it to the address listed in Customer Support.
Some transducers may have additional costs. Refer to the Accessory cata-
log or call Customer Support for information.
BEGINNING INSTALLATION
Now that you have determined the transducer mounting method, you
can begin installation of the 105SX. The fold out installation guide
included provides detailed step by step instructions for installation of the
control head and transducer. For transom mount transducer installations,
you will need the mounting template in the center of this manual.
In addition to the parts included you need the following for installation
and operation:
•Apowered hand drill and various drill bits
• Phillips and flat-head screw drivers
• A ruler or measuring tape
• Pen or pencil
•12 volt power source (your boat’s battery)
• A 1-amp fuse
•Afuse holder (if you are wiring directly to the boat’s battery)
•Silicone sealant (for sealing drilled holes)
•2-part, slow-cure epoxy (for inside the hull transducer installations)
INSTALLATION PREPARATION
TRANSDUCER EXCHANGE
5

USING THE 105SX
HOW SONAR WORKS
6
HOW SONAR WORKS
Your Humminbird unit uses sonar to
locate and define underwater
objects, define the bottom terrain, as
well as determine distance.
Sonar technology is based on sound
waves. Your Humminbird unit sends
out a sound wave signal. With this
signal it determines distance by
measuring the time between the
transmission of the sound wave and
when the sound wave is reflected off
an object. Your Humminbird uses the
reflected signal to interpret location,
size and composition of an object.
Sonar is very fast. A sound wave can travel from the surface to a depth
of 600' (185m) and back again in less than 1/4of a second. It is unlikely
that your boat can "outrun" this sonar signal.
The 105SX is a 200kHz, single-beam fishfinder. The 200 kHz frequency
provides excellent sonar resolution (the ability to distinguish small
returns or returns which are close to the bottom), while providing depth
capabilities to 600’ (185m). The shape of the sonar beam is symmetrical
and covers an area of approximately 24 degrees side to side and front to rear.
Actual depth capability depends on factors such as bottom hardness,
water conditions, and transducer installation. Units will typically read to
deeper depths in fresh water than in salt water

7
USING THE 105SX
SIMULATOR OPERATION
SIMULATOR OPERATION
The 105SX contains a simulator that allows you to use the unit as if you
are on the water. The simulator is invaluable for learning how to operate
the 105SX.
There are two ways to start the simulator. If
the unit is powered off, press and hold the
POWER button for approximately three
seconds until you hear a continuous chirp.
The simulator can also be started by
selecting the Simulator option on the start-
up screen after you power-up the unit.
When this screen is shown, simply press the
DOWN ARROW until “Simulator” is highlighted. When the screen times
out, the unit will be in simulator mode.
When in simulator operation, the 105SX responds to control inputs as if
it is in actual operation, so feel free to experiment, or to customize the
unit for your particular operation.
To exit Simulator mode, power the unit off.
When in simulator mode, the word “simulator” will flash on and
off in the top center part of the display.
FEATURE MEMORY
If your 105SX is installed with a transducer connected, any changes you
make to the set-up while in Simulator are retained in the unit’s memory.
This allows you to use simulator to experiment with the various set-up
options, and retain your selected settings for normal operation.

If you are using the 105SX in Simulator when no transducer is connected,
any selected options are lost when the unit is powered off. The 105SX
will return to Factory Settings, or options selected when last used with a
transducer, if no transducer is connected.
IMPORTANT: A transducer must be connected to the 105SX in
order to retain user settings selected when in simulator mode. If
no transducer is detected, the unit defaults to pre-selected options
when powered off.
What You See On-Screen
Your 105SX uses a 128 x 64 matrix
FSTN LCD display. This display provides
outstanding viewability in all light
conditions over a wide range of
temperatures.
At initial power-up, the 105SX uses
settings that were set at the factory.
After initial use, the 105SX will
remember the settings you enter.
There are several elements on-screen
that are common to all modes of
operation.
Speed/Temperature. The initial screen layout takes one of two basic forms
depending on presence of accessories such as Temperature or
Speed/Temperature sensors. Figure A shows the default view when the
Speed/Temp or Temperature accessory is installed. Figure B shows the default
view when no accessory is installed.
Depth. The digital depth number shows the water depth directly beneath
the transducer location.
Depth Range. The depth range is shown to the right of the screen. The
upper number is 0 indicating the surface of the water. The lower number
is one of the nine depth ranges available that best match the depth of
the water. As the depth of the water changes, the range changes as
necessary in order to retain a bottom representation on-screen.
8
USING THE 105SX
WHAT YOU SEE ON-SCREEN
Figure A