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Nielsen-Kellerman ClearNav GPS Receiver User Manual

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NKClearNavManual•Version0.5•July3,2008

Page59of86

numbertodisplaymostofthetimeasyou“outsmart”theairmass.



ExampleCalculation:

AsyoucruisealongonthisglidetheClearNavisloggingthedifferencebetweenthecurrent

measuredsinkrateandthetheoreticalsinkrateatthecurrentspeedfromthepolar.For

example,forasinglereadingifthemeasuredsinkrateis250ft/minuteandthepolargivesa

sinkrateof300ft/minatthecurrentspeedthenthenettovalueof+50ft/minisrecordedfor

thisdatapoint–indicatingthattheairmassisrisingat50ft/min.Themanynumberslogged

duringthisglideareaveragedandtheaverageisdisplayed.

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• 

AverageClimb

Thisistheaverageclimbratesincetake‐off–orsincethestartofthetask.Thenumberis

automaticallyresetwhenthetaskisstartedbecausethedatameasuredbeforethe startofthe

taskislikelytobeverydifferentfromthedatameasuredafterthestartofthetask.Manypilots

willfindthatthisnumberismuchlowerthantheirbestguessattheiraverageclimbrate.This

numberistheoreticallyagreatnumbertouseasarecommendedMacCreadysetting.

• 

AverageGlideNetto

Thisistheaveragenettoclimborsinkachievedinallglidessincetake‐off–orsincethestartof

thetask.Thenumberisautomaticallyresetwhenthetaskisstartedbecausethedata

measuredbeforethestartofthetask(whiletryingforminimumsinkratherthancross‐country

speed)islikelytobeverydifferentfromthedatameasuredafterthestartofthetask.Theterm

“netto”indicatesthatthesinkrateatthecurrentspeedfromglider’spolarisaddedtotheraw

varionumbersothatthedisplayednumbershowswhatthe

airmassisdoingratherthanthe

combinationofairmassmotionandglidersinkrate.Avalueofzeroindicatesthattheglides

have(onaverage)beendoneinstillair.Apositivevalueindicatesthattheglideshavebeen

done(onaverage)inrisingair.Anegativenumberindicatesthattheglideshavebeendone(on

average)insinkingair.Theoretically,youwillslowdowninliftandspeedupinsinkandshould

beabletogetapositivenumbertodisplaymostofthetimeasyou“outsmart”theairmass.

ToaccesstheVarioDisplayOptionsWindow:

PresstheFocusbutton onceortwiceuntiltheNumericInformationAreaatthebottomofthe

screenisinfocus(nottheSelectionBox).

PresstheLeftandRightbuttonstoputthefocusontheVarioWindow. 

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