Standard Horizon Ff520 owner manual What should I do if the Auto Modes FAIL?

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when the water is full of materials in suspension, with bad sea conditions.

7.6WHAT SHOULD I DO IF THE AUTO MODES FAIL?

Failure of auto modes can happen for various reasons. Hereafter you can find a range of possibilities.

7.7AUTO-RANGE FAILS IN VERY SHALLOW WATERS DIS- PLAYING A DIGITAL DEPTH READOUT DEEPER THAN THE ACTUAL VALUE. WHAT SHOULD I DO?

This usually happens if the STC is set to LONG or MID and the bottom is shallow or SHORT if the bottom is very shallow causing the auto-range to hook to the second or third echo from the bottom (since in shallow waters the sound bounces more times back and forth the surface to the bottom). Try decreasing the STC value to SHORT in shallow waters or to switch it to VERY SHORT or OFF.

7.8AUTO RANGE FAILS, AND THE DIGITAL DEPTH READOUT DISPLAYS A VERY SHALLOW READING. WHAT SHOULD I DO?

This usually happens if the STC is off or is set to a low value causing disturbance from surface clutter to be stronger than bottom echoes. Try increasing the STC value. As general rule STC has to be set as in shallow waters and LONG in depth waters.

7.9AUTO-RANGE FAILS IN VERY DEEP WATERS DISPLAYING A DIGITAL VERY SHALLOW DEPTH READOUT. WHAT SHOULD I DO?

The Fish Finder capability to detect the bottom decreases as the bottom depth increase. If the bottom composition is soft as mud, if the sea conditions are bad, if there are thermoclines or the water is full of materials in suspension it can further decrease thus causing the digital depth readout to fail. When this happens the auto-range algorithm also fails. To recover from this situation it is necessary to switch to manual range mode and to set the manual depth mode. When manual depth mode is selected the algorithm that calculates the digital depth readout searches for the bottom within the range manually selected by the user. At this point it is necessary to increase manually the range until the bottom becomes graphically visible. If the echoes from the bottom are strong enough, the Fish Finder shall look to the bottom giving a correct depth reading and shall be possible to return in auto range mode. Please note that if one or more of the conditions that reduce the echoes from the bottom listed above is true the bottom may be not visible at all, in this situation a strong thermocline or surface clutter may be interpreted by the Fish Finder as the bottom.

7.10AT A VERY SHALLOW RANGE UPPER HALF OF THE SCREEN APPEARS ALMOST COMPLETELY FILLED BY THE SUR- FACE CLUTTER. HOW CAN I ELIMINATE IT?

This is normal in shallow waters. To clean up the surface clutter without degrading the digital depth readout algorithm functionality there are two modes: 1) If Surface Declutter = OFF it is possible to set the STC value to custom setting the STC length to the same size of the

FF520

 

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Contents FF520 FCC Compliance Statement Table of Contents Index General Information IntroductionReplacement part Packing List0 FF520 Packing List Installation Mounting the FF520Connections FF520 Connecting the GPS Chart Plotters to the FF520CP155C/CP1000C/CP180/CP180i/CPV350 connections to FF520 CP180/CP180iOptional Connections CPV350 FF520 Tee CableCP175C connections to FF520 Second temp sensor Alarm BuzzerLED Status Indicator Nmea OutputPower Connections Selecting the FF520CP180/CP180i/CPV350 0 Selecting the FF520 on CP180/CP180i/CPV350 CP155C/CP175C/CP1000CUnderstanding the Fish Finder Fish FinderColor Bar Fish Finder windowFishes Understanding the Fish Finder displayScope Operating FrequencyMenu selection for CP155C/CP175C/CP1000C Displaying the Fish Finder0a Menu selection for CP180/CP180i/CPV350 Customizing the Fish Finder menu selectionSoft Keys for CP175C/CP1000C/CPV350 Customizing the Soft Keys for CP175C/CP1000C/CPV350 KEY Operation When Fish Finder page is ShownZoom in and Zoom OUT keys Menu keyEnter key Clear keyFocus Soft Key for CP175C/CP1000C/CPV350 Controls on Chart page or Fish page in Chart/Fish dual modeMark key Shuttlepoint knobSensitivity Time Control STC Soft Key System Update menuRange Soft Key Frequency Soft KeySystem Information page for CP180/CP180i/CPV350 Fish Fish Finder Setup MenuPresets SelectionAuto Gain ModeChart/Fish Range MenuInterference Rejection Sensitivity MenuGain Display Setup Keel Offset Transducer SetupAlarms Load Settings from User C-CARDSave Settings to User C-CARD Restore Current Preset Defaults Page FF520 Specifications SpecificationsFF520 Internal connections FF520 Internal ConnectionsSailboats Power BoatsTransducer Transducer MountingFairing Block Transducer TypesLow Profile Thru-Hull TransomOptional Transducer ID Sensors In-hullPage 0a The FF520 Tips of OperationsWhat are Preset MODES? HOW can I SET Optimal Operating ParametersWhat are Extreme Situations in Which Auto Modes MAY FAIL? What should I do if the Auto Modes FAIL? HOW can I Reduce the Surface CLUTTER? WHY do I Never see Fishes in the Range Between 0 to 2 FEET?27, 30 IndexA N D a R D H O R I Z O N L I M I T E D W a R R a N T Y
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