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Mini manual
21
850-164920 / Rev.A
Figuren skisserer forenklet hvordan havoverflaten og bunnen
kaster ekko tilbake til svingeren. I situasjon (A) vil du en
rekke svake ekko fra bølgene og fra kanusen havbunnen, men
vil like fullt enkelt klare å identifisere fiskestimen. I situasjon
(B) vil du klare å identifisere den øverste fiskestimen, men den
nederste vil være skjult i skyggen av knausen havbunnen.
Kjølevann fra ditt eget fartøy og fra andre båter i nærheten kan
også generere etterklang.
Blokkering
Båtens bevegelse gjennom sjøen vil ofte - spesielt i høy sjø -
produsere luftbobler som vandrer langs skroget. Dette kalles
blokkering. For å unngå blokkering er det viktig å senke
svingeren lengst mulig ned i vannet under skroget.
Temperatur- og saltskikt
I vannet vil du noen ganger oppleve at det dannes skikt med
forskjellig temperatur og/eller forskjellig saltholdighet. Lydens
hastighet i vann er avhengig av salt og temperatur, og hvis du
sender en sonarstråle ned mot et slikt skikt (A) vil den reflekteres
oppover igjen. Fisken du trodde du ville se (B) blir da ikke
synlig i det hele tatt.
Slike skikt er uvanlige i norske farvann.
Temperatur- eller saltskikt
23


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