Furuno CSH-5L/CSH-8L manual Bottom and tilt angle, How to discriminate fish echoes from the bottom

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1. OPERATIONAL OVERVIEW

1.4.2Bottom and tilt angle

Finding the proper tilt angle is of utmost importance when searching for fish, especially in coastal water fishing, where the depth of the fishing ground is from 50-100 m. In this type of fishing ground it is imperative that the bottom echo be always displayed to properly distinguish between fish and the bottom. When selecting a tilt angle, keep the following points in mind.

Case 1: Tilt angle 30 to 40 degrees

This tilt angle uses the full beamwidth to receive echoes, thus the entire bottom echo is displayed. Fish echoes may be hidden in the bottom echo.

Case 2: Tilt angle 10 to 20 degrees

This tilt angle receives bottom echoes within the bottom half of the beam. Fish echoes astern of the bottom echo are displayed.

Case 3: Tilt angle 0 to 5 degrees

This tilt angle may or may not display returning echoes. Fish echoes near the bottom echo are displayed.

1.4.3How to discriminate fish echoes from the bottom

The following figure illustrates how two fish schools (a) and (b) are displayed on screen using three different tilt angles.

Case 1: Tilt angle 30 to 40 degrees

Fish school is obscured by the bottom echo.

Case 2: Tilt angle 10 to 20 degrees

Fish school is located above the bottom echo (midwater).

Case 3: Tilt angle 0 to 5 degrees

Fish school is located close to the bottom echo.

Case 1

Case 2

 

Case 3

 

 

 

 

 

b

 

 

 

a

a

a

Fish s

ch

ool (a)

Fish school (a)

Fish school (a)

 

 

 

 

 

Bottom

Bottom

 

Bottom

(b)

 

 

Case 1

Case 2

Case 3

How to discriminate fish echoes from bottom

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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 menuNorm Choosing a display modeMode description Description Display COMBI-1COMBI-1 display sonar display + audio display Normal mode display sonar displaySonar display COMBI-1 display sonar display + audio displayCOMBI-2 display sonar display + echosounder display Choosing the display rangeCOMBI-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 Case 1 Tilt angle 30 to 40 degrees How to discriminate fish echoes from the bottomBottom and tilt angle Case 2 Tilt angle 10 to 20 degreesTilt angle for surface fish Points to considerTilt angle and surface fish example CSH-5L Depth, detection range and tilt angle Finding Range and Bearing to a TargetSuitable 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 noise with the interference rejector Rejecting Sonar Interference and NoiseIdentifying noise source Rejecting noise with the noise limiterRejecting interference with TX cycle Interference ringsEcho Averaging Choosing BeamwidthDeleting Weak Echoes 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 Event mark How to use the event markEvent Mark, Own Ship Position Mark Entering an event markDeleting an event mark Entering an own ship position markEvent marks Track Collectively Deleting MarksShip Programming for fishing ground or target fish Function Keys F1-F4Operating the function keys Erase Marks dialog boxTX Output Pulse Length TX Cycle TVG Near TVG FAR HOR Programming specific functionUseful programs main items only 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 Interference Suppressing InterferenceSuppressing Low Level Noise ClutterErasing Weak Echoes Weak echoesCurve Other Items on the Sounder MenuSounder menu description 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 Sea Surface ReflectionsWake WakeSidelobe echo False Echo by SidelobeNoise and Interference Noise and interferenceMarks Menu Marks and System MenusMarks menu Marks menu description Dimmer System MenuSystem menu Description of System menu 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 Unit Fuse Type Code No Fuse ReplacementFan Replacement Type Code NoTroubleshooting Symptom Check, RemedyTransducer not retracted Error MessagesMessage Meaning, Remedy Overvoltage 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 Color testWhite RED Green Blue Pattern testSIO test SIO testEcho tests Echo testsSpecifications of Color Scanning Sonar CSH-5L/8L Hull Unit Interface This page is intentionally left blank Sounder menu Menu TreeSonar 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.
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