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Pub. 988-0151-171
www.lowrance.com
X125, X126DF, X135, X136DF
Fish-finding & Depth Sounding Sonars
Operation Instructions
Copyright © 2003 Lowrance Electronics, Inc.
All rights reserved.
Lowrance
®
is a registered trademark of Lowrance Electronics, Inc.
Navionics
is a registered trademark of Navionics, Inc.
Lowrance Electronics may find it necessary to change or end our
policies, regulations and special offers at any time. We reserve the right
to do so without notice. All features and specifications subject to change
without notice. All screens in this manual are simulated. On the cover:
X136DF shown. Other models covered in the manual are similar.
For free owner's manuals and other information,
visit our web site:
www.lowrance.com
Lowrance Electronics Inc.
12000 E. Skelly Dr.
Tulsa, OK USA 74128-2486
i
Table of Contents
Sec. 1: Read Me First! ...............................................................1
Capabilities and Specifications: X125, X126DF, X135, X136DF..2
How Sonar Works.........................................................................3
How to Use this Manual: Typographical Conventions................4
Sec. 2: Installation & Accessories..........................................7
Preparations..................................................................................7
Transducer Installation................................................................7
Recommended Tools and Supplies...........................................8
Selecting a Transducer Location..................................................8
How Low Should You Go?.........................................................9
Shoot-Thru-Hull vs. Transom Mounting...................................10
Transom Transducer Assembly and Mounting.........................10
Trolling Motor Bracket Installation (Single-Frequency only)..16
Transducer Orientation and Fish Arches..................................17
Shoot-Thru-Hull Preparation and Installation.........................17
Speed/Temperature Sensors.................................................20
Sensor Chart...............................................................................21
Optional Speed Sensor Installation.......................................22
Power Connections......................................................................23
Mounting the Unit: Bracket, In-Dash or Portable....................25
Face Cover...................................................................................29
Sec. 3: Basic Sonar Operation...............................................31
Keyboard.....................................................................................31
Power/Lights (Turn Unit On and Off) .......................................32
Menus..........................................................................................32
Main Menu..............................................................................32
Sonar Menu.............................................................................34
Pages ...........................................................................................35
Basic Sonar Quick Reference...............................................38
Sonar Operations........................................................................39
Fish Symbols vs. Full Sonar Chart........................................41
Other Free Training Aids.......................................................42
Sec. 4: Sonar Options & Other Features ............................43
ASP (Advanced Signal Processing).........................................43
Alarms.........................................................................................44
Depth Alarms..........................................................................44
Zone Alarm..............................................................................45
Fish Alarm...............................................................................46
Brightness...................................................................................46
Calibrate Speed...........................................................................46
Chart Speed.................................................................................47
Contrast.......................................................................................48
ii
Depth Cursor...............................................................................48
Depth Range - Automatic...........................................................48
Depth Range - Manual................................................................49
To Turn Auto Depth Range on Again: ...................................49
Depth Range - Upper and Lower Limits ...................................49
FasTrack..................................................................................51
Fish I.D. (Fish Symbols & Depths).........................................51
FishTrack .................................................................................53
FishReveal ...............................................................................54
Frequency (Change Transducer Frequency).............................56
Grayline
.....................................................................................57
HyperScroll ..............................................................................59
Noise Rejection............................................................................59
Overlay Data...............................................................................59
To Change Displayed Data Font Size:...................................60
Ping Speed & HyperScroll.......................................................61
Pop-Up Help................................................................................62
Reset Options..............................................................................63
Reset Water Distance.................................................................63
Screen Contrast and Brightness................................................63
Sensitivity & Auto Sensitivity....................................................64
To Turn Auto Sensitivity Back on:.........................................66
Set Keel Offset............................................................................66
Set Language ..............................................................................67
Software Version Information....................................................67
Sonar Chart Mode.......................................................................68
Sonar Chart Display Options.....................................................68
Full Sonar Chart.....................................................................69
Split Zoom Sonar Chart..........................................................70
Split Frequency Sonar Chart (X126DF and X136DF only) ..70
Digital Data/Chart..................................................................71
Customizing the Digital Data/Chart Screen......................72
Flashgraf.................................................................................73
Sonar Simulator..........................................................................73
Stop Chart...................................................................................74
Surface Clarity............................................................................74
Transducer Type (X126DF and X136DF only)..........................75
Units of Measure.........................................................................76
Upper and Lower Limits ............................................................76
Zoom & Zoom Bar.......................................................................76
Zoom Pan.....................................................................................77
Sec. 5: Sonar Troubleshooting..............................................79
Sec. 6: Supplemental Material..............................................85
1
Section 1: Read Me First!
How this manual can get you out on the water, fast!
Welcome to the exciting world of digital sonar! We know you're anxious
to begin finding fish, but we have a favor to ask. Before you grab your
unit and begin installing it, please give us a moment or two to explain
how our manual can help you get the best performance from your com-
pact, wide-screen, fish finder.
First, we want to thank you for buying a Lowrance sonar. Whether
you're a first time user or a professional fisherman, you'll discover that
your unit is easy to use, yet capable of handling demanding sonar
tasks. You won't find another sonar unit with this much power and this
many features for this price!
Our goal for this book is to get you on the water fast, with a minimum
of fuss. Like you, we'd rather spend more time boating or fishing and
less time reading the manual!
So, we designed our book so that you don't have to read the whole thing
from front to back for the information you want. At the start (or end) of
each segment, we'll tell you what content is coming up next. If it's a
concept you're already familiar with, we'll show you how and where to
skip ahead for the next important topic. We've also made it easy to look
up any tips you may need from time to time. Here's how:
The manual is organized into 6 sections. This first section is an intro-
duction to the sonar unit. It tells you the basics you need to know be-
fore you can make the unit look below the surface to find some fish.
Section 2 will help you install your unit and the transducer. We'll also
tell you about some of the available accessories.
Section 3 covers Basic Sonar Operation. It will show you how easy it is
to run your sonar, right out of the box. This section features a one-page
Sonar Quick Reference. (If you've already jumped ahead and fig-
ured out how to install the unit yourself, and you just can't wait
any longer, turn to the Quick Reference on page 38 and head
for the water with your sonar unit!)
After you've gained some experience with your sonar, you'll want to
check out Section 4, which discusses more advanced Sonar Options and
Other Features.
When you come to a sonar menu command on the unit's screen, you can
look it up in the manual by skimming over the table of contents or index,
just flipping through Section 3 or scanning through the sonar options in
Section 4.
2
If you're having difficulty with your sonar, you can find an answer to
the most common problems in Section 5, Sonar Troubleshooting.
Finally, in Section 6, we offer Supplemental Material, including a list of
warranty and customer service information.
Now, if you're into the fine details, glance over the next segment on
specifications to see just how much sonar power your unit contains. It's
important to us (and our power users), but, if you don't care how many
watts of power the unit has, skip ahead to important information on how
sonar works, on page 3.
Capabilities and Specifications: X125, X126DF, X135, X136DF
General
Display:.............................5.0" (12.7 cm) diagonal high contrast Film
SuperTwist; programmable to viewing pref-
erence.
Resolution:......................480 pixel x 480 pixel resolution ; 230,400 to-
tal pixels. 16-level grayscale definition.
Backlighting:..................X136DF and X135:
White LED backlit screen and keypad.
X126DF and X125:
Amber LED backlit screen and keypad.
Input power:...................10 to 15 volts DC.
Case size:.........................5.4" H x 6.9" W x 3.4" D (13.8 x 17.6 x 8.6
cm); sealed and waterproof; suitable for
saltwater use.
Back-up memory:..........Built-in memory stores sonar records for
decades.
Languages:......................10; menu languages selectable by user.
Sonar
Frequency:......................50/200 kHz for X126DF and X136DF; 200
kHz for X125 and X135.
Transducers:..................A dual-frequency Skimmer
transducer with
built-in temperature sensor is packed with
the X126DF and X136DF. It has 35°/12° cone
angles. A single-frequency with built-in tem-
perature sensor is packed with the X125 and
X135. It has a 20° cone angle. Transducers
operate at speeds up to 70 mph (61 kts).
3
Transmitter:...................X136DF, X135 and X126DF:
4,000 watts peak-to-peak/500 watts RMS.
X125:
2,400 watts peak-to-peak/300 watts RMS.
Sonar sounding
depth capability:...........X136DF: 2,500 feet (762 meters).
X126DF: 1,700 feet (518 meters).
X135: 1,000 feet (305 meters).
X125: 800 feet (244 meters).
Actual capability depends on transducer con-
figuration and installation, bottom composi-
tion and water conditions. All sonar units
typically read deeper in fresh water than in
salt water.
Depth display:................Continuous display .
Audible alarms: .............Deep/shallow/fish/zone.
Automatic ranging:.......Yes, with instant screen updates.
Auto bottom track:........Yes.
Zoom bottom track:......Yes.
Split-screen zoom:.........Yes.
Surface water temp:.....Yes.
Speed/distance log:.......Optional (requires optional speed sensor).
NOTICE!
The storage temperature range for your unit is from -4 degrees to +167
degrees Fahrenheit (-20 degrees to +75 degrees Celsius). Extended stor-
age in temperatures higher or lower than specified will damage the liq-
uid crystal display in your unit. This type of damage is not covered by
the warranty. For more information, contact the factory's Customer
Service Department; phone numbers are listed on the last page.
How Sonar Works
Sonar has been around since the 1940s, so if you already know how it
works, skip ahead to the next segment on the typographical conventions
used in this manual. But, if you've never owned a sonar fish finder, this
segment will tell you the under water basics.
Sonar is an abbreviation for SOund NA
vigation and Ranging, a technol-
ogy developed during World War II for tracking enemy submarines.
(Lowrance developed the world's first transistorized sportfishing sonar in
4
1957.) A sonar consists of a transmitter, transducer, receiver and dis-
play. In simple terms, here's how it finds the bottom, or the fish:
The transmitter emits an electrical impulse, which the transducer con-
verts into a sound wave and sends into the water. (The sound frequency
can't be heard by humans or fish.) The sound wave strikes an object
(fish, structure, bottom) and bounces back to the transducer, which
converts the sound back into an electrical signal.
The receiver amplifies this return signal, or echo, and sends it to the
display, where an image of the object appears on the scrolling sonar
chart. The sonar's microprocessor calculates the time lapse between the
transmitted signal and echo return to determine the distance to the
object. The whole process repeats itself several times each second.
How to use this manual: typographical conventions
Many instructions are listed as numbered steps. The keypad and arrow
"keystrokes" appear as boldface type. So, if you're in a real hurry (or
just need a reminder), you can skim the instructions and pick out what
menu command to use by finding the boldface command text. The fol-
lowing paragraphs explain how to interpret the text formatting for
those commands and other instructions:
Arrow Keys
The arrow keys control a horizontal line depth cursor on the sonar
screen. The arrow keys also help you move around the menus so you
can execute different commands. They are represented by symbols like
these, which denote the down arrow key, the up arrow, the left arrow
and the right arrow: .
Keyboard
The other keys perform a variety of functions. When the text refers to a
key to press, the key is shown in bold, sans serif type. For example, the
"Enter/Icons" key is shown as
ENT and the "Menu" key is shown as
MENU.
Menu Commands
A menu command or a menu option will appear in small capital letters,
in a bold sans serif type like this:
DEPTH CURSOR. These indicate that you
are to select this command or option from a menu or take an action of
some kind with the menu item. Text that you may need to enter or file
names you need to select are show in italic type, such as data type.
5
Instructions = Menu Sequences
Most functions you perform with the sonar unit are described as a se-
quence of key strokes and selecting menu commands. We've written
them in a condensed manner for quick and easy reading.
For example, instructions for turning on the Fish ID feature would
look like this:
1. From the Sonar Page, press
MENU| to SONAR FEATURES|ENT.
2. Press to
FISH SYMBOLS|ENT|EXIT|EXIT.
Translated into complete English, step 1 above would mean: "Start on
the Sonar Page. Press the Menu key then repeatedly press (or press and
hold) the down arrow key to scroll down the menu and select (highlight)
the Sonar Features menu command. Then press the Enter key."
Step 2 would mean: "Press the right arrow key to select (highlight) the
Fish ID symbols command. Next, press the Enter key, then press the
Exit key twice."
7
Section 2:
Installation & Accessories
Preparations
You can install the sonar system in some other order if you prefer, but
we recommend this installation sequence:
Caution:
You should read over this entire installation section before drill-
ing any holes in your vessel!
1. Determine the approximate location for the sonar unit, so you can
plan how and where to route the cables for the transducer and power.
This will help you make sure you have enough cable length for the de-
sired configuration.
2. Determine the approximate location for the transducer and its cable
route.
3. Determine the location of your battery or other power connection,
along with the power cable route.
4. Install the transducer and route the transducer cable to the sonar
unit.
5. Install the power cable and route it to the sonar unit.
6. Mount the sonar unit.
Transducer Installation
These instructions will help you install your Skimmer
transducer on a
transom, on a trolling motor or inside a hull. These instructions cover
both single- and dual-frequency Skimmer transducers. Please read all
instructions before proceeding with any installation.
The smaller single-frequency Skimmers typically use a one-piece,
stainless steel mounting bracket. The larger dual-frequency Skimmers
typically use a two-piece, plastic mounting bracket. The trolling motor
mount uses a one-piece plastic bracket with an adjustable strap.
These are all "kick-up" mounting brackets. They help prevent damage if
the transducer strikes an object while the boat is moving. If the trans-
ducer does "kick-up," the bracket can easily be pushed back into place
without tools.
Read these instructions carefully before attempting the installation.
Determine which of the mounting positions is right for your boat. Use
Accessory Ordering Information
for all countries
To order Lowrance accessories such as power cables or transducers,
please contact:
1) Your local marine dealer or consumer electronics store. Most quality
dealers that handle marine electronic equipment or other consumer
electronics should be able to assist you with these items.
To locate a Lowrance dealer near you, visit our web site,
www.lowrance.com and look for the Dealer Locator. Or, you can consult
your telephone directory for listings.
2) U.S. customers: LEI Extras Inc., PO Box 129, Catoosa, OK 74015-0129
Call 1-800-324-0045 or visit our web site www.lei-extras.com.
3) Canadian customers can write:
Lowrance/Eagle Canada, 919 Matheson Blvd. E. Mississauga, Ontario
L4W2R7 or fax 905-629-3118.
Shipping Information
If it becomes necessary to send a product for repair or replacement, you
must first receive a return authorization number from Customer
Service. Products shipped without a return authorization will not be
accepted. When shipping, we recommend you do the following:
1. Please do not ship the knobs or mounting bracket with your unit.
2. If you are sending a check for repair, please place your check in an
envelope and tape it to the unit.
3. For proper testing, include a brief note with the product describing
the problem. Be sure to include your name, return shipping address
and a daytime telephone number. An e-mail address is optional but
useful.
4. Pack the unit in a suitable size box with packing material to prevent
any damage during shipping.
5. Write the Return Authorization (RA) number on the outside of the
box underneath your return address.
6. For your security, you may want to insure the package through your
shipping courier. Lowrance does not assume responsibility for goods
lost or damaged in transit.
91


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