User manual LOWRANCE M52 S-GPS

[. . . ] 988-0152-001 www. lowrance. com M52 S/GPS Fish-finding Sonar & GPS Plotter Installation and Operation Instructions Copyright © 2003 Lowrance Electronics, Inc. Marine-Tex is a trademark of Illinois Tool Works Inc. Lowrance Electronics may find it necessary to change or end our policies, regulations, and special offers at any time. All screens in this manual are simulated. For free owner's manuals and other information, visit our web site: www. lowrance. com Lowrance Electronics Inc. 1 Capabilities and Specifications: M52 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] The control bar used to adjust sensitivity up or down is the same whether the unit is in the automatic or manual mode. In automatic you can adjust sensitivity up to 100 percent but the unit will limit your minimum setting. In auto, the unit will continue to make small adjustments, allowing for the setting you selected. In manual mode, you have complete control over sensitivity, with the ability to set it anywhere from zero to 100 percent. Once you select a level in manual, the unit will continue to use that exact sensitivity setting until you change it or revert to auto mode. (When you reach the maximum or minimum limit, a tone sounds. ) At left, Sonar Menu with Sensitivity command selected. At right, the Sensitivity Control Bar. 58 To adjust sensitivity in manual mode: 1. First, turn off Auto Sensitivity: from the Sonar Page, press MENU| to AUTO SENSITIVITY|ENT. To turn Auto Sensitivity back on: From the Sonar Page, press MENU| to AUTO SENSITIVITY|ENT|EXIT. NOTE: To return to the original factory setting for Auto Sensitivity, see the entry in this section on Reset Options. If sensitivity is in manual mode, the Reset Options command will switch back to Auto and reset the factory setting at the same time. Tip: For quicker sensitivity adjustments, try leaving the Sensitivity Control Bar on the screen as the chart scrolls. You can see the changes on the screen as you press the up or down arrows. This is handy when there's a lot of clutter in the water, and you are matching the sensitivity to rapidly changing water conditions. Set Keel Offset This unit measures water depth from the face of the transducer. Since the transducer is installed below the water surface, the distance displayed by the digital depth, chart depth scale, chart cursor or fish symbols is not the exact water depth. If the transducer is 1 foot below the surface, and the screen shows the water depth as 30 feet, then the actual depth is 31 feet. On sailboats or other large vessels with deep drafts, the distance between the transducer installation and the keel or lower engine unit can be several feet. In those cases, an inexact depth reading could result in grounding or striking underwater structure. The Keel Offset feature eliminates the need for the navigator to mentally calculate how much water is under his keel. Keel Offset lets you calibrate the digital depth indicators: chart depth scale, chart cursor depth and fish symbol depth displayed on the screen. To calibrate the depth indicators, first measure the distance from the face of the transducer to the lowest part of the boat. We enter this as a negative 3. 5 feet, which makes the depth indicators perform as if the transducer's lower in the water than it really is. Press to so that the displayed number shows a minus (­) sign instead of the plus (+) sign. [. . . ] 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. [. . . ]