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Measuringanauticalmile

1.S tartingpoint(startstopwatch)

2.Measuredmile

3.Endpoint(stopstopwatch)

4.Firstpairofmarkers

5.Secondpairofmarkers

Toprovideamoreaccuratereadingthevesselshouldmakebetween4to6runsinbothdirections

toallowfortideandwindconditions.Theaverageofthetimetakenoverallrunsshouldbeusedto

calculateLogSpeed.

TheLogspeedcanthenbeworkedoutbytakingthedistancetravelled(1nauticalmile)anddividing

itbytheaveragetimetakentoperformtherun.Theresultingcalculationisyouraveragespeedin

knots.

PerformingaSpeedRunCalibrationusingSOG

Ifahigherlevelofprecisionisrequiredthanthatachievedwiththe1PointSpeedCalibration

procedure,aSpeedRunCalibrationshouldbeperformed.TheSpeedRunCalibrationwillensure

thattheLogSpeedreadingisaccurateoverthevessel’sfullspeedrange.

Prerequisites:

•SOGdatamustbeavailable.

•Y ouwillneedtobeunderway,withsufﬁcientspacetomaneuverunhindered.

•Inordertoachieveaccurateresults,waterconditionsmustbecalmwithzerotideandzerocurrent.

Note:

SpeedRunCalibrationcannotbeperformedwhenthetransducerisconnectedusingaSpeedP od.

ThestepsbelowdetailthemethodofcalibratingspeedtransducersconnectedusinganiT C-5

orsmarttransducers(e.g.:DST800).

WithaFavoritepagedisplayed:

1.Pressthe

Menubutton.

2.SelectSet-up.

3.SelectTransducersSet-up.

4.Select Continue.

Thedisplaywillsearchforandshowalistofconnecteddevices.(i.e.iTC-5orDST)

T ransducercalibration29

Raymarine i70 User Manual

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