Raymarine e7 - Page 193

Thedepthofindividualtargetscanbedisplayedbyswitchingonthe
TargetDepthIDintheshndermenuMenu>Presentation.The
numberoftargetdepthsdisplayedisinuencedbytheshalarm
sensitivitylevel.
Waterdepth
Asseadepthincreasessignalstrengthdecreases,resultingina
lighteron-screenimageofthebottom.
Sizeofthetarget
Thelargerthetarget,thelargerthereturnontheshnderdisplay.
Thesizeofashtargetisalsodependentuponthesizeofthesh’s
swimbladderratherthanitsoverallsize.Theswimbladdervariesin
sizebetweendifferentbreedsofsh.
Transducerfrequency
Thesametargetwillappeardifferentlywhenthetransducer
frequencyischanged.Thelowerthefrequencythebroaderthe
mark.
Clutter/Backgroundnoise
Theshnderpicturemaybeimpairedbyechoesreceivedfrom
oatingorsubmergeddebris,airbubblesoreventhevessel’s
movement.Thisisknownas‘backgroundnoise’or‘clutter’andis
controlledbythegainmodes.Thesystemwillautomaticallycontrol
thegainsettingsaccordingtothedepthandwaterconditions.You
canhoweveradjustthegainsettingsmanuallyifyouprefer.
Usingtheshnder
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