Depth data sourceWhere multiple sources of depth data exist on asystem and the depth Data Source is set to Auto thesystem will automatically select the optimum sourcefor depth data.The system will set the data source for depthaccording to the priority table below:1st CP450C SeaTalkhs2nd CP300 SeaTalkhs3rd DSM300 SeaTalkhs4th DSM30 SeaTalkhs5th Traditionalsonar variantmultifunctiondisplaysSeaTalkhs / internal6th DownVisionTMvariantmultifunctiondisplaySeaTalkhs / internal7th CP100 SeaTalkhs8th Instrument /multifunctiondisplaySeaTalkng9th Instrument SeaTalk10th Instrument /multifunctiondisplayNMEA 0183If multiple sonar modules of the same type arepresent on a SeaTalkhs network then the unit withthe highest serial number will be selected as thepreferred data source. For SeaTalkng and NMEA0183 networks the unit with the highest CAN addressis selected.If the preferred depth data source becomesunavailable then the system will automatically selectthe next highest priority data source.Refer to the Data Source menu section for details onselecting preferred data sources.Important: A depth offset must be set for allinstalled transducers to ensure consistent andaccurate data is shown. Refer to the Depth Offsetsection for details.Note: SideVisionTM cannot be used as a sourcefor depth data.19.5 Sonar crosstalk interferenceThere are 2 types of potential sonar crosstalkinterference in a Raymarine sonar system:1. SideVision sonar crosstalk interference2. Multiple sonar crosstalk interferenceThe types of crosstalk interference that youmay experience in your system depend on thecombination and type of sonar equipment installed,and the way in which the equipment has beeninstalled.SideVision sonar crosstalkinterferenceMultiple sonar crosstalkinterferenceDue to the high sensitivityof SideVision transducers,you may experience someminor crosstalk interferencebetween the left and rightreceiving channels in areasof strong target returns.Examples of strong targetreturns include solid objectssuch as underwater bridgestructure. This interferenceshows up in the Fishfinderapplication as subtlereflections from the rightsonar image displayed inthe left sonar image, or viceversa.When using multiple sonarmodules and transducersoperating in overlappingfrequency ranges, you mayexperience some crosstalkinterference between theranges. This interference isdisplayed in the Fishfinderapplication as vertical “raindrops” throughout the watercolumn. These vertical “raindrops” indicate that 2 sonarmodules are operating inclose frequency proximity toone another.SideVision sonar crosstalk interferenceCrosstalk interference is expected behavior in a highsensitivity device such as a SideVision transducer,and is not indicative of a fault with your transducer orsonar module.Reducing multiple sonar crosstalkinterferenceCrosstalk interference in systems with multiple sonarmodules and transducers is the result of a numberof factors, including installation, operation, andenvironment.• Choose an equipment combination thatminimizes overlapping frequencies. Whereverpossible, choose to use sonar modules andtransducers that operate in different frequencyranges (“Channels”), for example CP100 andCP300 sonar modules and CPT-100 and B744Vtransducers. This will help to ensure that eachcomponent is operating in a distinct relativefrequency range – for example, a “high” frequencyrange for the CP100 and a “low” frequency rangefor the CP300.• Only use the sonar channels that you reallyneed. Although it is possible to run multiple sonarFishfinder application 269
