Page 2 - THANK YOU
THANK YOU Thank you for choosing Humminbird, America’s #1 namein fishfinders. Humminbird has built its reputation bydesigning and manufacturing top-quality, thoroughlyreliable marine equipment. Your Humminbird is designedfor trouble-free use in even the harshest marineenvironment. In the unlikely ev...
Page 3 - TABLE OF CONTENTS
INSTALLATION PREPARATION . . . . . . . . . . . . . . . . . . . . . . . 2 Parts Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . 2A...
Page 4 - INSTALLATION PREPARATION; PARTS SUPPLIED
2 INSTALLATION PREPARATION PARTS SUPPLIED PARTS SUPPLIED Before installing your 250DX, please ensure the following parts areincluded 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• Publicati...
Page 5 - INSTALLATION OVERVIEW; Determining How to Mount the Transducer
3 INSTALLATION PREPARATION INSTALLATION OVERVIEW display on the control head. It should be installed in contact with thesurface of the water in an area that has smooth water flow - usually on thetransom of the boat. There are several mounting options for thetransducer. Review the following section t...
Page 6 - ALTERNATE TRANSDUCERS AND MOUNTING METHODS
4 Inside the hull installations require no holes be drilled into the boat andthrough experimentation, high-speed operation comparable to transommounting can be achieved. Two part, slow cure epoxy is required to gluethe transducer in place. ALTERNATE TRANSDUCERS AND MOUNTING METHODS The 250DX comes w...
Page 7 - TRANSDUCER EXCHANGE
(which do not conduct sonar signals) make inside the hull mountinginadvisable. Thru-hull mounting may require the use of a fairing block to level thetransducer with the waterline. Also, since special tools and knowledge maybe required to perform this type of installation it is best to refer to aqual...
Page 8 - HOW SONAR WORKS
USING THE 250DX HOW SONAR WORKS 6 HOW SONAR WORKS Your Humminbird unit uses sonar tolocate and define underwater objects,define the bottom terrain, as well asdetermine distance. Sonar technology is based on soundwaves. Your Humminbird unit sendsout a sound wave signal. With thissignal it determines ...
Page 9 - SIMULATOR OPERATION
7 USING THE 250DX SIMULATOR OPERATION Actual depth capability depends on factors such as bottom hardness, waterconditions, and transducer installation. Units will typically read to deeperdepths in fresh water than in salt water. SIMULATOR OPERATION The 250DX contains a simulator that allowsyou to us...
Page 10 - 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 willreturn to Factory Settings, or options selected when last used with atransducer, if no transducer is connected. IMPORTANT: A transducer must be connected ...
Page 11 - The graphic depiction of the
depth of the water changes, the rangechanges as necessary in order to retaina bottom representation on-screen. When in Auto mode, the horizontalline at the top of the screen is the“zero line,” representing the surfaceof the water. Occasionally there is agap in this line. This gap indicates theunit i...
Page 12 - WHAT YOU SEE ON SCREEN
distance measurement, so if the boat is moving up and down over flatbottom, the bottom depiction often appears in regular variations that matchwave timing. Structure. Structure is defined as any object physically attached to the bottom. The sonar configuration of the 250DX is optimized to give the m...
Page 13 - CONTROL FUNCTIONS
return meets certain additional criteria, afish symbol will be assigned. There arethree different size fish symbols used toindicate the intensity of the sonar return.While signal intensity is a good indicatorof relative fish size, different species offish have different sonar characteristics,so it i...
Page 16 - MENU FUNCTIONS
Menu Functions Sensitivity. The Sensitivity function controls the sensitivity of the sonar receiver. The 250DXautomatically adjusts the level of receiver sensi-tivity based on a number of factors includingthe depth of the water and the level of noisepresent. Noise can be caused by other electronic d...
Page 17 - The Depth Range function
15 Depth Range. The Depth Range function controls the vertical distance displayed onthe graphic area of the display. There arenine depth ranges available. The top of therange is always 0, or the surface of thewater. Ranges of 0–15', 0–30', 0–60',0–120', 0–180', 0–240', 0–360', 0–480',and 0–600' are ...
Page 19 - The 250DX contains an audible
17 USING THE 250DX MENU FUNCTIONS Automatic Zoom is especially helpful when looking for structure or bottomdetail. The Automatic Zoom keeps the bottom in view even in quickly changingterrain, but is most useful in flatter areas without considerable depth variation.Manual Zoom provides detailed infor...
Page 23 - There are three selections available:
21 Fish ID. There are three selections available: OFF, ID+ ON, and ADJUST. The factorysetting is ID+ ON. With Fish ID OFF, sonarreturns are displayed as “raw” information.There is no interpretation made by the unit.Selecting ID OFF also disables the fish alarm. ID+ ON enables the 250DX to interprett...
Page 26 - ADVANCED FEATURES; USING DIAGNOSTIC
Reset. With the many User Options available to customize the 250DX, it is easy to configure the unitin such a way that it is detrimental to a particularuse. By using the Reset function, all variable or user-controlled features (except Filter) of the 250DX arereturned to the factory settings. The Res...
Page 27 - MAINTENANCE; Other connections tested
MAINTENANCE MAINTENANCE Boat Speed/Water Temperature Connection. Other connections tested include the boat speed and surface water temperature sensors. Theseaccessory sensors can be purchased independently or together as a singlesensor (see the Humminbird Accessories catalog). If the sensors areconn...
Page 28 - TROUBLESHOOTING
26 mild cleaner. Do not wipe while dirt or grease is on the lens. Be careful toavoid scratching the lens. • If your boat remains in the water for long periods of time, algae and other marine growth can reduce the effectiveness of the transducer.Periodically clean the face of the transducer with liqu...
Page 29 - There is no bottom reading visible on the display.
27 MAINTENANCE TROUBLESHOOTING If the unit is wired through a fuse panel, ensure the panel is powered. Oftenaccessory fuse panels are controlled by a separate switch or the ignition switch.Also, often a fuse can appear to be good when in fact is not. Check the fusewith a tester or replace it with a ...
Page 31 - The screen begins to fade out. Images are not as sharp as normal.
29 7. My unit loses power at high speeds. Your 250DX has over-voltage protection that turns the unit off when inputvoltage exceeds 20 VDC. Some outboard motors do not effectively regulate thepower output of the engine’s alternator and can produce voltage in excess of 20volts when running at high RPM...
Page 32 - CUSTOMER SUPPORT; Humminbird
30 MAINTENANCE CUSTOMER SUPPORT CUSTOMER SUPPORT If you have any problems or questions with your Humminbird unit, contactyour local distributor. Humminbird Service Department 108 Maple Lane Eufaula, AL 36027 USA
Page 33 - SPECIFICATIONS
31 Operating Frequency . . . . . . . . . . . . . . . . . . . . .200 kHz and 83 kHz Power Output . . . . . . . . . . . . . . . . . . . . . . . . . . . .250 Watts (RMS) 2000 Watts (Peak to Peak) Area of Coverage . . . . . . . . . . . . . . . . . . . . .Narrow: 20° at -10 db Wide: 53° at -10 db Power R...
Page 34 - TO; Use
Remove and use for T ransducer Installation PLACE EITHER CORNER ON DEADRISE ANGLE TO P Use ⁵⁄₃₂ " (4.0mm) drill bit Drill Drill Use with XT series Transducers F iber glass Alumium Drill a set of tw o holes f or y our t y pe of boat hull. U se the upper set f or fiber glass or the lo w er set f o...
