Furuno CSH-5L/CSH-8L manual Fish School, Fish echoes

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6. INTERPRETING THE DISPLAY

6.2Fish School

A fish school appears as a mass of echoes. The color of the mass shows the density. To know the distribution and center point of a fish school, choose several different tilt angles.

(A) Sea surface fish

Tilt angle: 0˚ to 10˚

Fish school

Sea surface reflections

(B) Midwater, bottom fish Tilt angle: 30˚ or more

Fish echo which appears before bottom can be detected.

Bottom

Tilt angle: 0˚ to 20˚

Fish echo which appears together with or after bottom can be detected.

Fish school

Bottom echo not displayed because

of decreased tilt angle. Sea surface reflections are present.

Fish school

Large midwater fish school is present.

Bottom

To search bottom fish, use a narrow tillt angle so the bottom echo will be weak, enabling you to see bottom fish echoes.

Fish echoes

6-2

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Contents Color Scanning Sonar 00080940402 Safety Instructions Turn off the hull unit before using the hand crank Table of Contents Marks and Data Index Foreword FeaturesWord to the Owner of the CSH-5L/CSH-8L System configuration of CSH-5L System ConfigurationVii System configuration of CSH-8L ViiiControl Unit Operational OverviewControl unit Remote Controller option Remote controllerTurning on the power Basic Operating ProcedureLowering the transducer Transmitting Sonar menuAdjusting backlighting of control unit System menuChoosing a display mode Mode description Description DisplayNorm COMBI-1Normal mode display sonar display Sonar displayCOMBI-1 display sonar display + audio display COMBI-1 display sonar display + audio displayChoosing the display range COMBI-2 display sonar display + echosounder displayCOMBI-2 display sonar display + echosounder display Detection rangeRetracting the transducer, turning off the power Adjusting the gainExamples of proper and improper gain Automatic tilt on/off Setting the Tilt AngleTilt range Range m ±2-10 ±4-14 ±6-20 ±10-26 Range and tilt angleAuto tilt concept How to discriminate fish echoes from the bottom Bottom and tilt angleCase 1 Tilt angle 30 to 40 degrees Case 2 Tilt angle 10 to 20 degreesTilt angle for surface fish Points to considerTilt angle and surface fish example CSH-5L Finding Range and Bearing to a Target Suitable tilt angleDepth, detection range and tilt angle Location of trackball dataOperating procedure Sonar Menu OverviewDescription of sonar menu Sonar menu descriptionDescription Ref. Description of sonar menu con’t from previous This page intentionally left blank Eliminating Unwanted Echoes Fine Tuning the Sonar PictureHow TVG works Suppressing Bottom Tail Displaying Surface Fish Clearly1 AGC Pulse length 3 2ND AGCHow to adjust TX output Rejecting Sonar Interference and Noise Identifying noise sourceRejecting noise with the interference rejector Rejecting noise with the noise limiterRejecting interference with TX cycle Interference ringsChoosing Beamwidth Deleting Weak EchoesEcho Averaging Horizontal beamwidthThis page intentionally left blank Tracking a Fish School target lock Advanced Sonar OperationTarget lock mark and target lock data Target lock and tilt angle Detecting Fish Schools Aurally Fish alarm zone Fish AlarmFish alarm zones Entering a fish mark Measuring Fish School SpeedFish mark and fish mark data Relocating Fish School for Easy Observation How to use the off-center functionDeleting individual fish marks How to use the event mark Event Mark, Own Ship Position MarkEvent mark Entering an event markDeleting an event mark Entering an own ship position markEvent marks Track Collectively Deleting MarksShip Function Keys F1-F4 Operating the function keysProgramming for fishing ground or target fish Erase Marks dialog boxProgramming specific function Useful programs main items onlyTX Output Pulse Length TX Cycle TVG Near TVG FAR HOR Beamwidth Color Curve ResponseConfirming function key program Function key assignment confirmation screenHow the stabilizer works Suppressing Effects of Pitching and Rolling StabilizerStabilizer mark Advanced Sonar Operation Choosing the Range Echosounder ModeDisplay range and shift concept Adjusting the Gain Sounder menuMeasuring Depth Picture Advance SpeedMeasuring depth Suppressing Interference Suppressing Low Level NoiseInterference ClutterErasing Weak Echoes Weak echoesOther Items on the Sounder Menu Sounder menu descriptionCurve DraftMarks and Data on the Normal Display Marks and DataMarks and data on the normal display Description of marks and data on the normal display Points to North Heading MarkMarks and Data Press the R/B key. Own ship position and trackball mark are Marks and Data on the Echosounder and Audio Displays Marks and data on the echosounder and audio displaysOn the System menu Bottom Echo Interpreting the DisplayBottom echoes Fish School Fish echoesSea Surface Reflections WakeSea surface reflections WakeFalse Echo by Sidelobe Noise and InterferenceSidelobe echo Noise and interferenceMarks Menu Marks and System MenusMarks menu Marks menu description System Menu System menu Description of System menuDimmer Disp SelectDescription of System menu con’t from previous General Maintenance MAINTENANCE, TroubleshootingCleaning the Equipment Hull unit maintenance points Hull Unit MaintenanceLubrication points, zinc plate Hull unit Manually raising the transducerHand crank Fuse Replacement Fan ReplacementUnit Fuse Type Code No Type Code NoTroubleshooting Symptom Check, RemedyError Messages Message Meaning, Remedy OvervoltageTransducer not retracted High speedDiagnostic Tests Choosing a diagnostic testSingle test, Continuous test Description of diagnostic testsContinuous test example CSH-5L, 55 kHz transducer Panel test Panel testColor test White RED Green BlueColor test Pattern testSIO test SIO testEcho tests Echo testsSpecifications of Color Scanning Sonar CSH-5L/8L Hull Unit Interface This page is intentionally left blank Menu Tree Sonar menuSounder menu AP-1System menu Marks menuAP-2 Index IN-1

CSH-5L/CSH-8L specifications

Furuno CSH-5L and CSH-8L are advanced marine radar systems known for their cutting-edge technology and user-friendly interfaces. Designed primarily for maritime applications, these radar units cater to a wide range of vessels, from commercial ships to fishing boats. The primary distinguishing feature of the CSH-5L and CSH-8L radar systems lies in their ability to provide high-resolution images and precise detection of targets, ensuring navigational safety and operational efficiency on the water.

One of the standout technologies incorporated into both models is the pulse compression technique. This feature significantly enhances target resolution and minimizes blind spots, allowing the radar to detect smaller objects at greater distances. With the CSH-5L and CSH-8L's powerful signal processing capabilities, users can expect exceptional performance even in challenging weather conditions, ensuring reliable operation during storms or fog.

The CSH-5L model operates at a frequency range of 5 GHz, while the CSH-8L uses an 8 GHz frequency. Both radars are equipped with a rotating antenna that provides a wide coverage range, allowing for efficient monitoring of the surrounding marine environment. Their high sensitivity and low noise levels enhance target detection, making them particularly useful for locating small fishing vessels or buoys.

Another important characteristic of the Furuno CSH-5L and CSH-8L is their user-friendly interfaces. Both models feature intuitive controls, allowing operators to adjust settings easily and access critical information quickly. The displays are designed for clarity, enabling users to distinguish between targets and navigate effectively.

Additionally, the radar systems include advanced features such as automatic target tracking and target acquisition capabilities. This functionality allows users to monitor multiple targets simultaneously, providing essential situational awareness for safe navigation. The CSH-5L and CSH-8L also support integration with other onboard systems, including ECDIS (Electronic Chart Display and Information System), which enhances the overall effectiveness of maritime navigation.

In summary, the Furuno CSH-5L and CSH-8L radar systems represent the forefront of marine radar technology, offering exceptional detection capabilities, user-friendly controls, and robust integration options. Their advanced features ensure that mariners can navigate confidently, making them a vital asset for anyone operating in the marine environment.