Lowrance electronic X-70A 3D manual No fish arches when the Fish ID feature is off

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manual mode, then change the range to a realistic one, (for example, 0-100 feet) and increase the sensitivity. As you move into shallower water, a bottom signal should appear.

4.Check the battery voltage. If the voltage drops, the unit’s transmitter power also drops, reducing its ability to find the bottom or targets.

Bottom echo disappears at high speeds or erratic digital reading or weak bottom echo while boat is moving

1.The transducer may be in turbulent water. It must be mounted in a smooth flow of water in order for the sonar to work at all boat speeds. Air bubbles in the water disrupt the sonar signals, interfering with its ability to find the bottom or other targets. The technical term for this is Cavitation.

2.Electrical noise from the boat’s motor can interfere with the sonar.This causes the sonar to automatically increase its Discrimination or noise rejection feature. This can cause the unit to eliminate weaker signals such as fish or even structure from the display.Try using resistor spark plugs or routing the sonar unit’s power and transducer cables away from other electrical wiring on the boat.

No fish arches when the Fish ID feature is off:

1.Make certain transducer is pointing straight down. This is the most common problem if a partial arch is displayed.

2.The sensitivity may not be high enough. In order for the unit to display a fish arch, it has to be able to receive the fish’s echo from the time it enters the cone until it leaves. If the sensitivity is not high enough, the unit displays the fish only when it is in the center of the cone.

3.Use the Zoom feature. It is much easier to display fish arches when zoomed in on a small range of water than a large one. For example, you will have much better luck seeing fish arches with a 30 to 60 foot range than a 0 to 60 foot range. This enlarges the targets, allowing the display to show much more detail.

4.The boat must be moving at a slow trolling speed to see fish arches. If the boat is motionless, fish stay in the cone, showing on the display as straight horizontal lines.

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Contents 70A 3D Table of Contents Transducer Installation SpecificationsInstallation IntroductionTransducer Location Transducer Assembly and Mounting Nut at this time Sonar Unit Mounting Power Connections Temp CableLowrance KeyboardDisplay General Modes of Operation Digital BOX Sensitivity OperationAutomatic 3D Zoom 3D Operation3D Range 2D Transducer Element Se 2D Operation3D Variview Page 2D Range Automatic modeLection Manual mode Upper and Lower Limits2D Zoom Automatic mode 2D Zoom Manual Mode Bottom Depth ViewFastrak Depth Alarms Chart StopAlarms MenusPage Zone Alarm Fish I.D Fish AlarmAlarm Mute Display Contrast Digital Sonar 2D View OptionsDigital BOX Options 2D Fastrak BAR Zoom BARDisplay Zone Alarm BAR Chart CursorMenu Grayline Chart Speed Back LightsSpeaker Volume Units of MeasureASP Advanced Signal Processing Menu Surface ClarityTemperature Graph Adjustment FishtrackReset Distance LOG Menu 3D Enhance3D Simulator Unit freezes, locks up, or operates erratically TroubleshootingUnit won’t turn on No fish arches when the Fish ID feature is off Noise Lowrance Electronics Full ONE-YEAR Warranty Lowrance ElectronicsLowrances UPS Return Service Authorization RA NumberAccessory Ordering Information Keep this LabelHow to Obtain Service How to Obtain Service U.S.A. Only