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OPERATIONS
MANUAL
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THANK YOU THANK YOU FOR CHOOSING YOUR 425SX FISHFINDER, MADE BY TECHSONIC INDUSTRIES, MANUFACTURER OF AMERICA’S #1 NAME IN FISHFINDERS, HUMMINBIRD. HUMMINBIRD HAS BUILT ITS REPUTATION BY DESIGNING AND MANUFACTURING TOP QUALITY, THOROUGHLY RELIABLE MARINE EQUIPMENT. YOUR HUMMINBIRD PRODUCT 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. COMPLETE DETAILS ARE INCLUDED
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TABLE OF CONTENTS Section 1: Installation preparation . . . . . . . . . . . . . . . . . . . 2 Parts Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . 2 Alternative Transducers and Mounting Methods. . . . . . 4 Beginning Installation . . . . . . . . . . . . . . . . . . . . . . . . . 5 Section 2: USING THE 425SX. . . . . . . . .
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INSTALLATION PREPARATION PARTS SUPPLIED PARTS SUPPLIED Before installing your 425SX, please ensure the following parts are included in the box: • 425SX fishfinder • Transducer with 6m (20') of cable and mounting hardware kit • Mounting system and mounting hardware kit • 2m (6' ) power cable • Publications kit + Note: The 425SX includes speed and temperature sensors with appropriate hardware and instructions for installation. If any of these items are missing contact your local dealer. ACCESSORIE
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INSTALLATION PREPARATION INSTALLATION OVERVIEW 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 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
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INSTALLATION PREPARATION ALTERNATE TRANSDUCERS AND MOUNTING METHODS signal from passing through. Inside the hull installations require no holes to be drilled into the boat and through experimentation, high-speed operation comparable to transom mounting can be achieved. Two part, slow cure epoxy is required to glue the transducer in place. ALTERNATE TRANSDUCERS AND MOUNTING METHODS The 425SX comes with everything necessary for installation and operation on most boats. However, there are several s
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INSTALLATION PREPARATION BEGINNING INSTALLATION BEGINNING INSTALLATION Now that you have determined the transducer mounting method, you can begin installation of the 425SX. 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 at the back of this manual. In addition to the parts included you need the following for installation and ope
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USING THE 425SX HOW SONAR WORKS 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
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USING THE 425SX SIMULATOR OPERATION 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 425SX 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 S
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USING THE 425SX WHAT YOU SEE ON-SCREEN At initial power-up, the 425SX uses settings that were set at the factory. After initial use, the 425SX will remember the settings you enter. There are several elements on-screen that are common to all modes of operation. Figure A Temperature/Speed. The initial screen layout takes one of two basic forms depending on whether the optional Temp/Speed accessory is installed. Figure A shows the default view when the Temp/Speed accessory is installed. Figure B
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USING THE 425SX WHAT YOU SEE ON-SCREEN When in Auto mode, the horizontal line at the top of the screen is the “zero line,” representing the surface of the water. Occasionally there is a gap in this line. This gap indicates the unit is updating the display even if the bottom is not visible on-screen, or if the bottom information is not changing. New sonar information appears on the right side of the graphic area of the display and moves to the left as new information is displayed. The 425SX autom
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USING THE 425SX WHAT YOU SEE ON SCREEN depiction of these objects varies with boat speed and direction. The best way to learn to interpret structure is to operate the 425SX over a variety of known conditions and experiment with user functions to best represent those conditions on-screen. Surface Clutter. Surface clutter is the layer of water near the surface that is rich in algae and other growth, and often is aerated by wind or wave action. This area of water interferes with sonar transmission
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USING THE 425SX WHAT YOU SEE ON SCREEN speed and movement of the fish greatly affect the shape of the arch. When moving slowly, a fish creates an elongated arch. With the boat moving fast the arch appears shorter. A partial arch forms when the fish does not move through the entire cone angle. Fish Arch Diagram The 425SX displays structure such as submerged grass, brush, trees and wrecks on the bottom. Structure can be distinguished by comparing the area just above and below the main bottom retu
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USING THE 425SX CONTROL FUNCTIONS the intensity of the sonar return. While signal intensity is a good indicator of relative fish size, different species of fish have different sonar characteristics, so it is not always possible to distinguish fish size between varying species. The signal intensity is "normalized" for depth so that a small fish close to the boat does not appear as a large fish symbol. ID+ adds an additional piece of information to help the user locate fish. On selected fish symbo
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USING THE 425SX CONTROL FUNCTIONS When powering the unit from a battery such as in portable applications, you can prolong the battery life by using the backlight at a minimum. The three lower buttons, MENU, UP ARROW and DOWN ARROW work together to control the 425SX menu-controlled user functions. 2D View View. VIEW selects one of several screen configurations or “views” possible depending on the transducer in use. When using the standard transducer, without the optional speed/temp sensor connect
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USING THE 425SX CONTROL FUNCTIONS Chart View The Chart View, shows only the digital depth readout, leaving more screen area for fish location and bottom depiction. Menu. MENU displays a menu on-screen for adjustment. In normal operation, pressing MENU repeatedly cycles through all available menus. A menu remains on-screen for several seconds, and can be adjusted by using the ARROW Menu keys. If no adjustment is made in the allotted time, the menu disappears. If you want the menu to remain on-s
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USING THE 425SX MENU FUNCTIONS After an adjustment is made to a menu function, the menu times out after a few seconds and the unit returns to normal operation. Menu Layout. All menus use the same basic layout. The heading at the top describes the menu function. The UP ARROW and DOWN ARROW symbols to the left of the menu indicate which buttons are available for adjustment. In menus that have several possible settings, a range of adjustment indicator shows the total range available and the curren
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USING THE 425SX MENU FUNCTIONS The user has the option of High Sensitivity Sensitivity at “0” adjusting the Sensitivity higher or lower based on personal preference. You can select one of 11 sensitivity settings from - 5 to +5. A setting of 0 (factory setting) has no effect on the automatic sensitivity control. Increasing the sensitivity (+1 through +5) enables the unit to display the information from progressively smaller sonar returns. By decreasing the Low Sensitivity sensitivity (-1 throu
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USING THE 425SX MENU FUNCTIONS The range that positions the bottom depiction closest to the bottom of the screen, will best utilize the available display resolution. Using the factory setting of AUTO the 425SX can automatically adjust the depth range depending on the depth of the water. The unit tries to maintain the bottom depiction about ²⁄₃ down the total range (for example, in 6 m (20') of water, the 0-10m (0-30') range would be selected). This provides the best display resolution and theref
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USING THE 425SX MENU FUNCTIONS Zoom. The 425SX uses a greatly enhanced Zoom capability called “TruZoom” which offers expanded information on a select area of sonar information. Zoom is similar to Depth Range because it controls the range of information displayed on screen. Zoom, however, allows for selection of ranges beneath the surface so any area of water between the surface and the bottom can be enlarged to provide more detailed information. By using the full display to show a small area of
