Specifications

SimradSX90
Figure12Mackerel(1)
Thisimageshowsaschool
ofmackereldetectedat
40degreesstarboardand
markedastarget"6".The
sonarisoperatedinBow
Upmodewithfullscreen
view.Theoperational
rangeis2000meter,and
theverticaltiltissetto5
degrees.Thedistanceto
theschoolis1952meters.
andthedepthisindicated
tobe93fathoms.This
meansthatthemackerel
schoolislocatedonthe
bottom.Operational
frequencyis30kHz,
andHyperbolicFMis
used.Theechoesshown
betweenthemackereland
thevesseliswakefroma
pairoftrawlersarrivingat
thescene.
Figure13Mackerel(2)
Thisisthesamescenario
asabove(1),butlater.
Thevesselisclosertothe
schoolofmackerel,now
onlyabout250meters
away.BowUp/180Vertical
modeisused.Thevertical
viewshowstheschoolat
approximately50fathoms
depth.Thevariationin
bottomshowsuneven
spotswithhardandsoft
bottom.Theoperational
frequencyis30kHz,and
HyperbolicFMisused.
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