Raymarine E70085 Dragonfly - Sonar Check

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ItemDescription
1
Skyview—avisualrepresentationofthepositionoftracked
satellites.
2
Satellitestatus—displaysthesignalstrengthandstatusof
eachsatelliteidentiedintheskyviewdiagramontheleftof
thescreen.Thecoloredbarshavethefollowingmeanings:
•Grey=searchingforsatellite.
•Green=satelliteinuse.
•Orange=trackingsatellite.
3
HorizontalDilutionofPosition(HDOP)—ameasureof
GPSaccuracy,calculatedfromanumberoffactorsincluding
satellitegeometry,systemerrorsinthedatatransmissionand
systemerrorsintheGPSreceiver.Ahigherguresignies
agreaterpositionalerror.AtypicalGPSreceiverhasan
accuracyofbetween5and15m.Asanexample,assuming
aGPSreceivererrorof5m,anHDOPof2wouldrepresent
anerrorofapproximately15m.Pleaserememberthateven
averylowHDOPgureisNOguaranteethatyourGPS
receiverisprovidinganaccurateposition.Ifindoubt,check
thedisplayedvesselpositioninthechartapplicationagainst
youractualproximitytoaknownchartedobject.
EstimatedHorizontalPositionError(EHPE)—ameasure
ofGPSaccuracy,thisindicatesthatyourpositioniswithina
circleradiusofthestatedsize67%ofthetime.
4
Fixstatus—indicatestheactualmodetheGPSreceiveris
reporting(NoFix,Fix,DFixorSDFix).
5
Mode—themodecurrentlyselectedbytheGPSreceiver.
6
Datum—TheGPSreceiver'sdatumsettingaffectsthe
accuracyofthevesselpositioninformationdisplayedin
thechartapplication.InorderforyourGPSreceiverand
multifunctiondisplaytocorrelateaccuratelywithyourpaper
charts,theymustbeusingthesamedatum.
TheaccuracyoftheGPSreceiverdependsontheparameters
detailedabove,especiallytheazimuthandelevationangles
whichareusedintriangulationtocalculateyourposition.
6.5Sonarcheck
Warning:Sonaroperation
•NEVERoperatethesonarwiththevesseloutof
thewater.
•NEVERtouchthetransducerfacewhenthe
sonarispoweredon.
•SWITCHOFFthesonarifdiversarelikelytobe
within7.6m(25ft)ofthetransducer.
Checkingthesonarapplication
Fromthesonarapplication:
1.Checkthedisplay.
Withthetransduceractiveyoushouldseeadepthreadingin
thedatacellinthetopleftofthedisplay.
Gettingstarted
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