Raymarine RL80C Plus Specifications Page 177

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Chapter 7: Setting Up the System Defaults 7-21
Datum Selection
YoucanselecteitherWGS 84 orLOCAL datum. In LOCAL mode,youare
presentedwith alistofdatums;use thetrackpadto scrollthroughthelist,then
pressENTER to selectthe optionandclosethe menu.
CAUTION:
Changingthechart datum does not causeanywaypointorroutesstored
inthechartplotter to moveonthedisplay,althoughtheirlatitudeand
longitudechangestoreflectthenewdatum.
Whenaddingwaypointsnumericallyto thewaypointlist,orvia
SeaTalk,NMEA or
hsb
2
,it isimportantthattheyarereferencedtothe
samedatum to whichthedisplayiscurrentlyset.
Whenyou change datum selection,the systemattemptstosetanyconnected
GPStothe new mode, using SeaTalkand NMEA set up commands. A
messageshows whethertheset up was successfulornot.
Position Offset
Youcanoffset the vesselpositiontoallowfor differences between the GPS
andpaper chartdata.This may be usefulifyouareusing a datum thatisnot
available onthe Chartplotter, orifyou are referringto a paperchartdrawn to
unknowndatum.
You can changethe offsetby moving the cursortotheknown vesselposition.
Thisoffsetis appliedto all incomingpositiondata.The defaultoffset valueis
zero.
Whenpositionoffset isswitched on, alldisplayedvesselpositiondata is
annotated(C) toindicateit has been corrected.
To switch the position offset on/off:
1. SelectthePOSITION OFFSET option,thenpressthe OFFSET OFF ON soft key
totogglethe optionon/off.The lastselectedoffset value is added to posi-
tiondata andthevesselis displayedat the correctedposition.
Tosetanewoffsetvalue:
1. SelectthePOSITION OFFSET option, thenpresstheSET UP OFFSET soft key.
Ifnecessary,positionoffset is automatically toggled on.
2. Usethetrackpadtomovethecursortotherequiredvesselposition;thecur-
sorposition is displayedin a positionoffsetdatabox.
3. Pressthe ACCEPT OFFSET soft key, thevesselis displayedat the new posi-
tion.Press ENTER to returntothedefaultdisplay.
To settheoffsetvaluetozero:
1. SelectthePOSITION OFFSET option, thenpresstheSET UP OFFSET soft key
2. Pressthe CANCEL OFFSET softkey. The positionoffsetvalueis set to zero.
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