User manual LOWRANCE X136DF

[. . . ] 988-0151-171 www. lowrance. com X125, X126DF, X135, X136DF Fish-finding & Depth Sounding Sonars Operation Instructions Copyright © 2003 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. 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. 2 How Sonar Works . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] The auto settings will track the bottom, displaying it in the lower portion of the screen. The full sonar chart will scroll from right to left, showing you what's under the boat as you cruise across the water. As you're watching the sonar returns, you can change the display by: Zoom in to enlarge the chart for more detail: press ZIN. Press MENU|ENT and the Sensititvy Menu will appear on the left of your screen. Boosting sensitivity will show more information on your screen, which may cause clutter. Reducing sensitivity will filter out some information, but could omit important images. We recommend adjusting sensitivity until the background is lightly "peppered" -- that is, scattered dots appear, but individual objects (like fish arches or bottom structure) can be easily picked out of the background. Stop the boat and get your lure or bait into the water at the depth indicated on the sonar chart. Gauge the fish depth by visually comparing the fish arches with the depth scale on the right side of the screen, or get a more accurate measure with the Depth Cursor. If you are drifting at a very low speed or anchored, you are not moving fast enough for a fish to return the tell-tale fish arch signal. As you drift over a fish, or as a fish swims through the transducer's signal cone, the fish echo will appear as a straight line suspended between the surface and the bottom. 38 Sonar Operations As you can see from the quick reference on the previous page, basic operation is pretty easy, right out of the box. If you are a sonar novice, try operating the unit with the factory defaults until you get a feel for how it's working. As you're learning the basics, there is one setting you might want to tinker with from time to time -- Sensitivity. If you want to see more detail, try increasing the sensitivity, a little at a time. Decreasing the sensitivity can reduce the clutter and show the strongest fish echoes, if fish are present. As you change the sensitivity setting, you can see the difference on the chart as it scrolls. Fig. 4 These figures show results of different sensitivity levels on the same location. 4: Sensitivity set at 100 percent. 39 You can change the sensitivity level whether you are in Auto Sensitivity mode or Manual Sensitivity mode. The adjustment method works the same in both modes, but it gives you slightly different results. Adjusting sensitivity in Auto Sensitivity Mode is similar to manually adjusting a car's speed with the accelerator pedal while cruise control is on. You can tell the car to run faster, but when you let off the gas the cruise control automatically keeps you from running slower than the minimum speed setting. [. . . ] If you're in the United States and you have technical, return or repair questions, please contact the Factory Customer Service Department. Before any product can be returned, you must call customer service to determine if a return is necessary. Many times, customer service can resolve your problem over the phone without sending your product to the factory. To call us, use the following toll-free number: 800-324-1356 8 a. m. [. . . ]