Raymarine e7 - Page 142

Withexperience,theapproximatesizeofdifferentobjectscanbe
determinedbytherelativesizeandbrightnessoftheechoes.
Youshouldbearinmindthatthesizeofeachon-screentargetis
affectedby:
•Thephysicalsizeofthereectingobject.
•Thematerialfromwhichtheobjectismade.Metallicsurfaces
reectsignalsbetterthannon-metallicsurfaces.
•Verticalobjectssuchascliffsreectsignalsbetterthansloping
objectssuchassandbanks.
•Highcoastlinesandmountainouscoastalregionscanbeobserved
atlongerradarranges.Therefore,therstsightoflandmaybea
mountainseveralmilesinlandfromthecoastline.Althoughthe
coastlinemaybemuchnearer,itmaynotappearontheradar
untilthevesselisclosertoshore.
•Sometargets,suchasbuoysandsmallvesselsdifculttodiscern,
becausetheydonotpresentaconsistentreectingsurfaceas
theybobandtossaboutinthewaves.Consequentlytheseechoes
tendtofadeandbrighten,andattimesdisappearmomentarily.
•Buoysandsmallvesselsresembleeachother,butvesselscan
oftenbedistinguishedbytheirmotion.
Note:AGPSreceiverandafastheadingsensorarerequiredfor
MARPAoperation,andtoenableradar/chartoverlay.
Radarcontextmenu
Theradarapplicationincludesacontextmenuwhichprovides
positionaldataandmenuitems.
Theradarcontextmenucanbeaccessedby:
•SelectingalocationusingtheJoystickandpressingtheOk
button,or
•Selectingandholdingonanareaonscreen—Hybridtouch
multifunctiondisplaysonly.
Thecontextmenuprovidesthefollowingpositionaldataforthe
cursorlocationinrelationtoyourvessel:
•Latitude
•Longitude
•Range
•Bearing
Thecontextmenualsoprovidethefollowingmenuitems:
•AcquireTarget
•PlaceVRM/EBL
•PlaceWaypointAtCursor
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e7/e7D—Userreference