Raymarine Dragonfly-4 Pro - Sonar Application Overview

8.1DownVision
™
applicationoverview
TheDownVision
™
applicationusesacompatible
transducertoproduceadetailedstructureviewof
thewatercolumnbeneathyourvesselThisenables
youtoaccuratelydistinguishbottomstructure,and
underwaterobjects.DownVision
™
usesCHIRP
processingwithacentered350KHzpingfrequency,
whichprovidesahigherresolutionimagethanthe
Sonarapplication.
TheDownVision
™
applicationdisplaysascrolling
imagewhichscrollsfromrighttoleftacrossthe
screen.
TheDownVision
™
applicationusesmonochrome
palettesandshadingtodifferentiatebetweentarget
strengths.
D12780-1
7
1
3
6
2
4
5
1
Depthreading—Currentdepthofthebottom.
2
Scrollingpaused—Scrollingpauseswhenthe
Joystickisusedtomovethecursoraroundthescreen).
3Depthlines—Horizontaldashedlinesdrawnatregular
intervalstoindicatethedepthfromthesurface.
4
Cursor—Displayedincursormode.
5
Depthmarkers—Thesenumbersindicatedepth.
6
Speed—CurrentvesselSpeedOverGround(SOG).
OnlyapplicabletodisplayswithGPS/GNSSreceivers
7
Watertemperature—Currentwatertemperature.
8.2Sonarapplicationoverview
TheSonarapplicationusesacompatibletransducer
toproduceadetailedviewofshandthewater
columnincludingbottomunderyourvessel.This
enablesyoutoaccuratelydistinguishbetween
differentsizesofsh,bottomstructure,and
underwaterobjects.TheSonarapplicationuses
CHIRPprocessingwithacentered200KHzping
frequency,whichprovidesagreaterdepthrange
thanDownVision™butlessdetail.
TheSonarapplicationdisplaysascrollingimage
whichscrollsfromrighttoleftacrossthescreen.
TheSonarapplicationusesdifferentcolorsto
differentiatetargetstrengths.Thecolorsusedare
dependentupontheselectedcolorpalette(e.g.the
classicbluecolorpaletteusesbluetoidentifythe
weakesttargetsandredforthestrongest).
D12782-1
8 9
1
3
5
7
2
4
6
1
Depthreading—Currentbottomdepth.
2
Scrollingpaused—Scrollingpauseswhenthe
Joystickisusedtomovethecursoraroundthescreen).
3Depthlines—Horizontaldashedlinesdrawnatregular
intervalstoindicatethedepthfromthesurface.
4
Cursor—Displayedincursormode.
5
Bottomline—Displaysathicklinetoidentifythe
bottom.
6Depthmarkers—Thesenumbersindicatedepth.
7
Speed—CurrentvesselSpeedOverGround(SOG).
OnlyapplicabletodisplayswithGPS/GNSSreceivers
8
Watertemperature—Currentwatertemperature.
9DepthTargetID—Depthsaredisplayedagainst
recognizedtargets.ThesensitivityoftheseIDsis
directlylinkedtotheFishAlarmsensitivity;thegreater
theshalarmsensitivity,thegreaterthenumberof
labelledreturns.
Thesonarimage
Interpretingthebottomusingsonar
Itisimportanttounderstandhowtocorrectlyinterpret
thebottomstructurerepresentedon-screen.
Thebottomusuallyproducesastrongecho.
Thefollowingimagesshowhowdifferentbottom
conditionsarerepresentedon-screen:
60
Dragony–4/Dragony–5/Dragony–7/Wi–Fish