Operation Manual

14.1Howtheshnderworks
Theshnderapplicationusesasonarmoduleandasuitablesonar
transducer.Thesonarmoduleinterpretssignalsfromthetransducer
andbuildsupadetailedunderwaterview.
Thetransducerislocatedonthebottomoftheboat,itsendspulses
ofsoundwavesintothewaterandmeasuresthetimeittakesforthe
soundwavetotraveltothebottomandback.Thereturningechoes
areaffectedbybottomstructureandbyanyotherobjectsintheir
path,forexamplereefs,wrecks,shoalsorsh.
Colorsareusedonthedisplaytoindicatethestrengthofthereturns.
Youcanusethisinformationtodeterminethebottomstructure,
thesizeofshandotherobjectsinthewater,suchasdebrisor
airbubbles
Note:Sometransducersincludeadditionalsensorstomeasure
watertemperatureand/orspeed.
14.2Raymarinesonarmodules
ThetablebelowlistsRaymarine’ssonarmodulesandwhether
CHIRPtechnologyisused.
DSM30non-CHIRP
DSM300non-CHIRP
CP450CCHIRP
NewcSeries(internalsonar)non-CHIRP
NeweSeries(internalsonar)non-CHIRP
Broadbandsonartechnology
Traditionalsoundersuseasinglecarrierfrequencyorcarrierwave
forthesonarping.Thesesoundersworkbymeasuringthetimeit
takesthepingechotoreturntothetransducertodeterminetarget
depth.Usingthismethodif2targetsareclosetogethertheyare
shownasasinglelargetarget,ratherthanmultiplesmallertargets.
Byusingabroadbandsweptfrequency'CHIRP'thesignalcan
distinguishbetweenmultipleclosetargetswhichenablesthe
soundertodisplaymultipletargetsinsteadoflargecombined
targets.
Someofthebenetsareimproved:
•targetresolution.
•bottomdetectioneventhroughbaitballsandthermoclines.
•detectionsensitivity.
1 2
D12 2 2 3-1
1
Traditionalsonar
BroadbandCHIRPsonar
158NewcSeries/NeweSeries