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Operations Manual
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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
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TABLE OF CONTENTS INSTALLATION PREPARATION . . . . . . . . . . . . . . . . . . . . . . . 2 Parts Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . 2 Alternative Transducers and Mounting Methods. . . . . . 4 Transducer Exchange . . . . . . . . . . . . . . . . . . . . . . . . . 5 USING THE 250DX . . . . . . . . . . . . . . . . .
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INSTALLATION PREPARATION PARTS SUPPLIED PARTS SUPPLIED Before installing your 250DX, please ensure the following parts are included in the box: • 250DX fishfinder • Transducer with 6m (20') of cable and mounting hardware kit • Mounting system and mounting hardware kit • 6m (20') power cable • Publications kit If any of these items is missing, contact your local distributor . ACCESSORIES Humminbird offers a wide assortment of accessories that complement and expand the capability of your new 250DX
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INSTALLATION PREPARATION INSTALLATION OVERVIEW 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 section to determine the method that works for you and your boat. Determining How to Mount the Transducer The 250DX includes a model XT-6-20 transducer. This transducer can be mounted on the transom of the bo
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INSTALLATION PREPARATION ALTERNATE TRANSDUCERS AND MOUNTING METHODS 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 is required to glue the transducer in place. ALTERNATE TRANSDUCERS AND MOUNTING METHODS The 250DX comes with everything necessary for installation and operation on most boats. However, there are several situations which may require a di
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INSTALLATION PREPARATION TRANSDUCER EXCHANGE (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. TRANSDUCER EXCHANGE Other transducers are available as replacements for the standard transducer. You may exchange your new and
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USING THE 250DX 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 250DX SIMULATOR OPERATION 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. SIMULATOR OPERATION The 250DX 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 250DX. There are two ways to start the simulator. If the unit is powered off, press and hold the PO
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USING THE 250DX WHAT YOU SEE ON-SCREEN If you are using the 250DX in Simulator when no transducer is connected, any selected options are lost when the unit is powered off. The 250DX 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 250DX in order to retain user settings selected when in simulator mode. If no transducer is detected, the unit defaults to pre-selected options when po
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USING THE 250DX WHAT YOU SEE ON-SCREEN Bottom Depiction Zero Line depth of the water changes, the range changes as necessary in order to retain a bottom representation 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 in
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USING THE 250DX WHAT YOU SEE ON SCREEN distance measurement, so if the boat is moving up and down over flat bottom, the bottom depiction often appears in regular variations that match wave timing. Structure. Structure is defined as any object physically attached to the bottom. The sonar configuration of the 250DX is optimized to give the most accurate depiction of bottom structure possible. Grass, trees, stumps, wrecks or other debris are accurately displayed, however the depiction of these obje
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USING THE 250DX CONTROL FUNCTIONS Fish in Wide Beam return meets certain additional criteria, a fish symbol will be assigned. There are three different size fish symbols used to indicate 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 c
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USING THE 250DX CONTROL FUNCTIONS powered off, press and hold POWER for several seconds until a continuous chirp is heard. Light. LIGHT controls the unit’s display backlight. With the unit powered on, press LIGHT once to turn the backlight on “high.” Press LIGHT a second time to turn the backlight on “low,” and a third time turns the backlight off. The backlight is very effective for low-light and nighttime operation. When the backlight is on, the 250DX will consume more power than with the bac
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USING THE 250DX CONTROL FUNCTIONS affect the menu adjustment. The ARROW buttons often can be used when no menu is on-screen. In these situations, pressing the ARROW button affects the function of the active (last- used) menu. This is a short-cut to menu operation. The menu appears on-screen while the adjustment is made and times out. A frequently used menu can be adjusted very quickly using this technique. After an adjustment is made to a menu function, the menu times out after a few seconds and
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USING THE 250DX MENU FUNCTIONS Menu Functions Sensitivity. The Sensitivity function controls the sensitivity of the sonar receiver. The 250DX automatically adjusts the level of receiver sensi- tivity based on a number of factors including the depth of the water and the level of noise present. Noise can be caused by other electronic devices, engines, trolling motors, propeller cavitation and hydrodynamic flow among others. The user has the option of adjusting the Sensitivity higher or lower based
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USING THE 250DX MENU FUNCTIONS Depth Range. The Depth Range function controls the vertical distance displayed on the graphic area of the display. There are nine depth ranges available. The top of the range is always 0, or the surface of the water. Ranges of 0–15', 0–30', 0–60', 0–120', 0–180', 0–240', 0–360', 0–480', and 0–600' are available. In the metric version, ranges of 0–5, 0–10, 0–20, 0–40, 0–60, 0–80, 0–110, 0–150, and 0–185 metres are available.The range that positions the bottom depict
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USING THE 250DX MENU FUNCTIONS To return to automatic Depth Range control, press the MENU button until the Depth Range menu appears on- screen and use the UP ARROW to select AUTO. Zoom. Zoom is similar to Depth Range because it controls the range of information displayed on screen. Zoom, however, allows 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 are
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USING THE 250DX MENU FUNCTIONS Automatic Zoom is especially helpful when looking for structure or bottom detail. The Automatic Zoom keeps the bottom in view even in quickly changing terrain, but is most useful in flatter areas without considerable depth variation. Manual Zoom provides detailed information of any area from the surface to the bottom. In manual Zoom, the Zoom range does not move as the terrain changes. When the range is shown in the menu, the upper number represents the top of the
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USING THE 250DX MENU FUNCTIONS Fish Alarm. The Fish Alarm alerts you to the presence of fish, or other targets not connected to the bottom. The Fish Alarm has three different settings that correspond to the three different size fish symbols shown on-screen. The default setting is “OFF.” With the “Large fish only” setting, the 250DX alarms on only those targets that are represented by the large fish symbols. The 250DX can be set to alarm on only large and medium fish, or set to alarm on all fish
