15.18 Sensitivity settingsThe Sensitivity settings menu provides access tofeatures that enhance what is displayed onscreen. Inmost situations default values should be adequate.Legacy, traditional and CHIRP sonar modulesCPx70externalCHIRPexternalTradi-tionalexternalTradi-tionalinternalLegacyexternalManual/ AutoGainAutoGainModesAutoGainOffsetManual/ AutoInten-sityAutoInten-sityOffsetColorGainTVGAutoTVGModesDepthSensi-tivityColorThres-holdPowerModeDownVisionTM and SideVisionTMsonar modulesDownVisionTM SideVisionTMGainContrastNoise FilterColor ThresholdGainThe gain settings alter the way the sonar moduleprocesses background noise. Adjusting the gainsettings can improve the sonar image, howeverfor optimum performance in most conditions, werecommend that you use the auto settings.The gain control determines the strength abovewhich echoes are displayed onscreen.20% Manual Gain Auto Gain 80% Manual GainAutoIn Auto mode the sonar module automatically adjuststhe gain setting to suit current conditions.Auto Gain modesWhen connected to a Legacy sonar module or aTraditional internal sonar module 3 Auto Gain modesare available:• Cruising (Low)• Trolling (Med)• Fishing (Fast)Auto Gain OffsetWhen connected to a CPx70 series sonar moduleAuto Gain can be offset by +/–50%. This allowssmall modification to be made to the gain, whilestill utilizing Raymarine’s proprietary noise filter andtarget identification algorithms.ManualIf necessary you can set the gain controls manually,between a value of 0% to 100%. This value shouldbe set high enough to see fish and bottom detail butwithout too much background noise. Generally ahigh gain is used in deep and/or clear water; a lowgain in shallow and/or murky water.The new values remain set even when you switchoff the display.Onscreen gain controlSelecting the onscreen control enables you to adjustthe setting as required.When connected to a CPx70series sonar module the Autogain can be offset by +/-50%When connected to nonCPx70 series externalCHIRP, external Traditionalor DownVisionTM sonarmodules gain modes are notrequired.Fishfinder application 213
