Raymarine E90W - Radar Range and Image Quality

Poweringtheradarscanneronandoff
Intheradarapplication:
1.PressthePOWERbuttononyourmultifunctiondisplay.
2.Usingtherelevantsoftkeys,selecttheoperatingmodeforthe
radarscanner.
9.4Radarrangeandimagequality
Maximumradarrange
Theusablerangeoftheradarislimitedbyfactorssuchasthe
heightofthescanner,andheightofthetarget.
Maximumradarrangeisessentiallyline-of-sight,soislimitedby
theheightofthescannerandtheheightofthetargetasillustrated
below:
a
1
a
2
Earth
h
H
Cliff
Radar
D1643-3
R
max
R
max
= 2.23 ( h + H )
R
max
h
H
maximum radar range
radar antenna height
target height
in nautical miles
in metres
in metres
R
max
= radar horizon of antenna (
a
1
) + radar horizon of target (
a
2
)
Thetablebelowshowstypicalmaximumradarrangesforvarious
radarantennaheightsandtargetheights.Rememberthatalthough
theradarhorizonisgreaterthantheopticalhorizon,theradar
canonlydetecttargetsifalargeenoughtargetisabovetheradar
horizon.
Antennaheight
(meters)
Targetheight
(meters)
Maximumrange
(Nauticalmiles)
33
7.7
31010.9
5
38.8
5
1012
118E-SeriesWidescreenUserreference