Raymarine a68 WiFi - Page 194

InterpretingSideVision™images
ThefollowingillustrationshowshowSideVision™imagesonyourmultifunctiondisplayarerelatedtothe
watercolumnandseaoortothesidesofyourvessel.
InterpretingSideVisionimages
SideVision™imagesareconstructedline-by-line,
similartothewayatelevisionpictureiscomposed
ofmanyhorizontallines.Eachsuccessiveping
fromtheSideVision™transduceraddsanewline
ofimagedatatothetopofyourdisplay.Eachnew
lineshowssonarreturnsfromboththeportand
starboardsidesofyourvessel.
Asnewlinesareaddedwitheachsuccessive
ping,olderdatagraduallyscrollsdownthedisplay,
buildingupadetailedimageofthewatercolumnand
seaoortothesidesofyourvessel.Ifyourvessel
maintainsthesamebearingandspeedforaperiod
oftime,youcaninterprettheimageasaplanofthe
seaooralongyourvessel’scourse.
Theillustrationalsoidentiesexamplesoffeatures
thatmaybevisibleinSideVision™images:
•Water:closetoyourvessel,theSideVision™
sonarbeamsmaynotinteractwithanysolid
objectsinthewatercolumnuntiltheyhitthesea
oor.Thewatercolumnclosetoyourvesselis
displayedasadarkbandintheimage.Theabrupt
changetoalightersectionintheimageindicates
wheretheseaoorisrstdetectedwitheachping.
•Baitball:objectsinthewatercolumnclosetoyour
vesselmaybedetectedbeforetheSideVision™
beamshittheseaoor.Inthisexample,abaitball
isshownwithinthewatercolumn,atadistanceof
approximately30feetfromthevessel.
•Vegetation:objectsincontactwiththeseaoor
thatareclosetoyourvesselmaybeclearlyvisible
intheimageatthepointwheretheSideVision™
beamshittheseaoor.Inthisexample,the
shapesintheimageindicatevegetationattached
totheseaoor.
•Structure:thelighterregionsoftheSideVision™
imagerepresenttheseaoor.Itmaybepossible
todetectdifferencesinthebottommaterial(for
example,whereanareaofmudmeetsanarea
ofgravel)aswellassolidstructuressuchas
pipelinesandpiers.Largersolidstructures,and
seaoorrelief,mayrevealanareaofshadow
directedawayfromyourvessel.
Note:UnlikeDownVision™,SideVision™does
notprovidedirectdepthreadings.Thescale
shownacrossthetopoftheimageindicatesthe
distanceoffeaturesfromyourvessel.
194
LightHouseMFDoperationinstructions