Furuno CSH-5L/CSH-8L manual Interpreting the Display, Bottom Echo, Bottom echoes

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6.INTERPRETING THE DISPLAY

6.1Bottom Echo

When the tilt angle is changed, the bottom echo will appear on the screen. When the tilt angle is decreased, the bottom trace becomes wider and weaker. By observing the bottom condition on the screen, the skipper can prevent the net from being damaged by a reef or a shipwreck.

(A) Flat bottom

Tilt angle: 10˚ to 15˚

(B) Flat bottom

Tilt angle: 20˚ or more

Decreased tilt angle Only half of vertical beam width captures the bottom.

Bottom is displayed narrower and in stronger colors when compared to (A).

Shallow bottom is displayed in a strong color and with a short tail.

Bottom

The deeper, sloping bottom echo is displayed in a weak color and with a long tail.

Bottom echoes

6-1

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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 Features ForewordWord to the Owner of the CSH-5L/CSH-8L System Configuration System configuration of CSH-5LVii Viii System configuration of CSH-8LOperational Overview Control UnitControl unit Remote controller Remote Controller optionBasic Operating Procedure Turning on the powerLowering the transducer Sonar menu TransmittingSystem menu Adjusting backlighting of control unitCOMBI-1 Choosing a display modeMode description Description Display NormCOMBI-1 display sonar display + audio display Normal mode display sonar displaySonar display COMBI-1 display sonar display + audio displayDetection range Choosing the display rangeCOMBI-2 display sonar display + echosounder display COMBI-2 display sonar display + echosounder displayAdjusting the gain Retracting the transducer, turning off the powerExamples of proper and improper gain Setting the Tilt Angle Automatic tilt on/offTilt range Range and tilt angle Range m ±2-10 ±4-14 ±6-20 ±10-26Auto tilt concept Case 2 Tilt angle 10 to 20 degrees How to discriminate fish echoes from the bottomBottom and tilt angle Case 1 Tilt angle 30 to 40 degreesPoints to consider Tilt angle for surface fishTilt angle and surface fish example CSH-5L Location of trackball data Finding Range and Bearing to a TargetSuitable tilt angle Depth, detection range and tilt angleSonar Menu Overview Operating procedureSonar menu description Description of sonar menuDescription Ref. Description of sonar menu con’t from previous This page intentionally left blank Fine Tuning the Sonar Picture Eliminating Unwanted EchoesHow TVG works Displaying Surface Fish Clearly Suppressing Bottom Tail1 AGC 3 2ND AGC Pulse lengthHow to adjust TX output Rejecting noise with the noise limiter Rejecting Sonar Interference and NoiseIdentifying noise source Rejecting noise with the interference rejectorInterference rings Rejecting interference with TX cycleHorizontal beamwidth Choosing BeamwidthDeleting Weak Echoes Echo AveragingThis page intentionally left blank Advanced Sonar Operation Tracking a Fish School target lockTarget lock mark and target lock data Target lock and tilt angle Detecting Fish Schools Aurally Fish Alarm Fish alarm zoneFish alarm zones Measuring Fish School Speed Entering a fish markFish mark and fish mark data How to use the off-center function Relocating Fish School for Easy ObservationDeleting individual fish marks Entering an event mark How to use the event markEvent Mark, Own Ship Position Mark Event markEntering an own ship position mark Deleting an event markEvent marks Collectively Deleting Marks TrackShip Erase Marks dialog box Function Keys F1-F4Operating the function keys Programming for fishing ground or target fishBeamwidth Color Curve Response Programming specific functionUseful programs main items only TX Output Pulse Length TX Cycle TVG Near TVG FAR HORFunction key assignment confirmation screen Confirming function key programSuppressing Effects of Pitching and Rolling Stabilizer How the stabilizer worksStabilizer mark Advanced Sonar Operation Echosounder Mode Choosing the RangeDisplay range and shift concept Sounder menu Adjusting the GainPicture Advance Speed Measuring DepthMeasuring depth Clutter Suppressing InterferenceSuppressing Low Level Noise InterferenceWeak echoes Erasing Weak EchoesDraft Other Items on the Sounder MenuSounder menu description CurveMarks and Data Marks and Data on the Normal DisplayMarks and data on the normal display Points to North Heading Mark Description of marks and data on the normal displayMarks 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 Interpreting the Display Bottom EchoBottom echoes Fish echoes Fish SchoolWake Sea Surface ReflectionsWake Sea surface reflectionsNoise and interference False Echo by SidelobeNoise and Interference Sidelobe echoMarks and System Menus Marks MenuMarks menu Marks menu description Disp Select System MenuSystem menu Description of System menu DimmerDescription of System menu con’t from previous MAINTENANCE, Troubleshooting General MaintenanceCleaning the Equipment Hull Unit Maintenance Hull unit maintenance pointsLubrication points, zinc plate Manually raising the transducer Hull unitHand crank Type Code No Fuse ReplacementFan Replacement Unit Fuse Type Code NoSymptom Check, Remedy TroubleshootingHigh speed Error MessagesMessage Meaning, Remedy Overvoltage Transducer not retractedChoosing a diagnostic test Diagnostic TestsDescription of diagnostic tests Single test, Continuous testContinuous test example CSH-5L, 55 kHz transducer Panel test Panel testPattern test Color testWhite RED Green Blue Color testSIO test SIO testEcho tests Echo testsSpecifications of Color Scanning Sonar CSH-5L/8L Hull Unit Interface This page is intentionally left blank AP-1 Menu TreeSonar menu Sounder menuMarks menu System menuAP-2 IN-1 Index

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.