Raymarine E70085 Dragonfly - Product Information

2.3Productinformation
Informationrelatingtoyourproductisshownbelow
Part
numberFeatures
0
0
0
0
00
00
0
E70085
•InternalGPS.
•Internal2channelCHIRPsonar
module
–Sonar—Centred200KHz
–DownVision—Centred350KHz
.
CHIRPSonaroverview
Sonarinterpretssignalsfromthetransducerandbuildsupa
detailedunderwaterview.Thetransducersendspulsesof
soundwavesintothewaterandmeasuresthetimeittakesfor
thesoundwavetotraveltothebottomandback.Thereturning
echoesareaffectedbybottomstructureandbyanyotherobjects
intheirpath,forexamplereefs,wrecks,shoalsorsh.
Sonarproducesa25°conicalshapedbeam,thecoverageofthe
conicalbeamisthewatercolumndirectlybeneaththevessel.
Conicalbeam
D12784-1
Sonariseffectiveatarangeofspeeds.Indeeperwatersthe
CHIRPbandwidthisautomaticallyrestrictedtoimprovebottom
lockandthedetectionofmovingobjects(e.g.sh)inthewider
watercolumn.
CHIRPsonarscreenexample
CHIRPDownVisionoverview
DownVisioninterpretssignalsfromthetransducerandbuildsup
adetailedunderwaterview.Thetransducersendspulsesof
soundwavesintothewaterandmeasuresthetimeittakesfor
thesoundwavetotraveltothebottomandback.Thereturning
echoesareaffectedbybottomstructureandbyanyotherobjects
intheirpath,forexamplereefs,wrecks,shoalsorsh.
DownVisionproducesa60°sidetosideand1.4°foretoaft
beam.ThecoverageoftheDownVisionbeamisawatercolumn
directlybeneathandtothesidesofthevessel.
DownVisionbeam
D12777-1
DownVisioniseffectiveatlowervesselspeeds.Indeeper
waterstheCHIRPbandwidthisautomaticallyrestrictedto
improvebottomlockandthedetectionofmovingobjects(e.g.
sh)inthewiderwatercolumn.
Thewide,thinbeamproducescleartargetreturns.Theuseof
CHIRPprocessingandahigheroperatingfrequencyprovide
amoredetailedimage,makingiteasiertoidentifybottom
structuresaroundwhichshmayreside.
CHIRPDownVisionscreenexample
Handbookandproductinformation
13