Raymarine i70 - Performing a Speed Run Calibration Using SOG

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