User manual HUMMINBIRD PIRANHA 4 INSTALL GUIDE

[. . . ] The returned "echoes" are plotted on the Piranha's LCD display and create a very accurate picture of the underwater world with distance to underwater objects such as the bottom, fish and structure. What You See On Screen The Piranha displays underwater information in an easy-tounderstand format. The top of the display corresponds to the water surface, and the bottom of the display corresponds to the Depth Range automatically selected for the current water depth. The Bottom Contour varies between the two as the depth under the boat changes. Digital readouts provide precise information for depth, fish and water temperature (separate purchase may be required). Water Surface Line Depth ­ Measured at the Transducer Water Temperature Capable (Optional purchase required) Fish Icons Fish ID Symbol w/ Fish Depth Structure IDTM Bottom Contour Depth Range* Understanding the On-screen Images As the boat moves, terrain and bottom composition variations are displayed on-screen. [. . . ] Select either OFF to view "raw" sonar returns, or ON to take advantage of Piranha's ability to identify sonar returns that are determined to be a fish. A select number of possible fish returns will be displayed with depth. Fish ID Raw Sonar If the unit comes into contact with salt spray, wipe the affected surfaces with a cloth dampened in fresh water. Do not use a chemical glass cleaner on the lens - this may cause cracking in the lens. When cleaning the LCD protective lens, use a chamois and non-abrasive, mild cleaner. If your boat remains in the water for long periods of time, marine growth can reduce the effectiveness of the transducer. Periodically clean the face of the transducer with liquid detergent. Note: Piranha 5's dual beam feature indicates the depth of the return and the beam that the return comes from. Returns from the narrow beam are shown with solid fish icons while the wide beam returns are displayed with hollow fish icons. O-13 If your boat remains out of the water for a long period of time, it may take some time to wet the transducer when returned to the water. Small air bubbles can cling to the surface of the transducer and interfere with proper operation. These bubbles dissipate with time, or you can wipe the face of the transducer with your fingers after the transducer is in the water. Never leave the unit in a closed car or trunk--the extremely high temperatures generated in hot weather can damage the electronics. 4. When in very shallow water, I get gaps in the bottom reading and inconsistent digital depth indication. The depth is measured from the transducer, not necessarily from the surface. Check the transducer cable -- if the outer jacket of the cable has been cut and the cable is in contact with bare metal, you will need to repair the cut with electrical tape. If there is no problem with the cable, disconnect the transducer from the unit and see if the problem is corrected, to confirm the source of the problem. If the transducer is transom-mounted, there are two adjustments available to you--height, and running angle. Make small adjustments and run the boat at high speeds to determine the effect. This can also be a result of air or turbulence in the transducer location caused by rivets, ribs, etc. Your Piranha has over-voltage protection that turns the unit off when input voltage exceeds 20 VDC. Some outboard motors do not effectively regulate the power output of the engine's alternator and can produce voltage in excess of 20 volts when running at high RPMs. The SureVolt power stabilizer from Humminbird maintains a steady voltage to the unit and solves this problem. The display shows many black dots at high speeds and high sensitivity settings. You are seeing noise or interference caused by one of several sources. If engine noise is causing the interference, the problem will intensify at higher RPMs. [. . . ] We will make every effort to repair your unit within three business days from the receipt of your unit at our factory. Units received on Friday are typically shipped by the following Wednesday, units received Monday are typically shipped by Thursday, etc. All repair work is performed by factory-trained technicians to meet exacting factory specifications. Factory-serviced units go through the same rigorous testing and quality control inspections as new production units. [. . . ]