User manual EAGLE FISHMARK 480 OPERATION INSTRUCTION

[. . . ] 988-0143-711 www. eaglesonar. com FishMark 480 and SeaFinder 480DF Fish-finding & Depth Sounding Sonars Installation and Operation Instructions Copyright © 2003 - Eagle Electronics All rights reserved. Eagle® is a registered trademark of Eagle Electronics Marine-Tex is a trademark of Illinois Tool Works Inc. Eagle 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. eaglesonar. com Eagle Electronics P. O. Box 669 Catoosa, OK USA 74015 Printed in USA. Table of Contents Sec. [. . . ] 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. To turn off the unit, press and hold PWR key for three seconds. Sonar Operations As you can see from the quick reference, 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. 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. In the sonar unit, auto mode will let you increase sensitivity to 100 percent, but the unit will limit your minimum setting. This prevents you from turning sensitivity down too low to allow automatic bottom tracking. When you change the setting with auto turned on, the unit will continue to track the bottom and make minor adjustments to the sensitivity level, with a bias toward the setting you selected. 40 Adjusting sensitivity in Manual Sensitivity Mode is similar to driving a car without cruise control -- you have complete manual control of the car's speed. In the sonar unit, manual mode allows you to set sensitivity at 100 percent (maximum) or zero percent (minimum. ) Depending on water conditions, the bottom signal may completely disappear from the screen when you reduce sensitivity to about 50 percent or less! Fig. [. . . ] This warranty gives you specific legal rights and you may also have other rights which may vary from state to state. REMINDER: You must retain the sales slip or sales receipt proving the date of your original purchase in case warranty service is ever required. EAGLE ELECTRONICS PO BOX 669, CATOOSA, OK 74015 (800) 324-1354 87 How to Obtain Service. . . . . . in the USA: We back your investment in quality products with quick, expert service and genuine Eagle replacement parts. 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. [. . . ]