Specifications

2.2CHIRPSonaroverview
Sonarinterpretssignalsfromthetransducerandbuildsupa
detailedunderwaterview.Thetransducersendspulsesof
soundwavesintothewaterandmeasuresthetimeittakesfor
thesoundwavetotraveltothebottomandback.Thereturning
echoesareaffectedbybottomstructureandbyanyotherobjects
intheirpath,forexamplereefs,wrecks,shoalsorsh.
Sonarproducesa25°conicalshapedbeam,thecoverageofthe
conicalbeamisthewatercolumndirectlybeneaththevessel.
Conicalbeam
D12784-2
Sonariseffectiveatarangeofspeeds.Indeeperwatersthe
CHIRPbandwidthisautomaticallyoptimizedtoimprovebottom
lockandthedetectionofmovingobjects(e.g.sh)inthewider
watercolumn.
CHIRPsonarscreenexample
2.3CHIRPDownVision
TM
overview
DownVision
TM
interpretssignalsfromthetransducerandbuilds
upadetailedunderwaterview.Thetransducersendspulsesof
soundwavesintothewaterandmeasuresthetimeittakesfor
thesoundwavetotraveltothebottomandback.Thereturning
echoesareaffectedbybottomstructureandbyanyotherobjects
intheirpath,forexamplereefs,wrecks,shoalsorsh.
DownVision
TM
producesawide–angleside-to-sidebeamanda
thinfore-to-aftbeam.ThecoverageoftheDownVision
TM
beam
isawatercolumndirectlybeneathandtothesidesofthevessel.
DownVisionbeam
D12777-2
DownVision
TM
iseffectiveatlowervesselspeeds.Indeeper
waterstheCHIRPbandwidthisautomaticallyoptimizedto
improvebottomlockandthedetectionofmovingobjects(e.g.
sh)inthewiderwatercolumn.
Thewide,thinbeamproducescleartargetreturns.Theuseof
CHIRPprocessingandahigheroperatingfrequencyprovide
amoredetailedimage,makingiteasiertoidentifybottom
structuresaroundwhichshmayreside.
CHIRPDownVision
TM
screenexample
Documentandproductinformation
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