442704/A
631
Sonar beam deflections
On warm days – especially during summer – the sea surface will be heated by the sun.
The water temperature will gradually decrease with increasing depth. On cold days, you
may experience the opposite. The cold water will be close to the surface, and the water
temperature increases with increasing depth.
Water temperatures on a warm day
When the temperature decreases (A) closer to the bottom, the sonar beam is deflected down
as indicated by the illustration. The school of fish (B) you thought you would see will not
be visible at all.
Water temperatures on a cold day
When the temperature decreases (A) closer to the surface, the sonar beam is deflected up as
indicated by the illustration. The school of fish (B) you thought you would see will not be
visible at all. Instead you will probably see a ring of surface echoes.
Related topics
Summary of Contents for Simrad ST90
Page 1: ...kongsberg com simrad Simrad ST90 REFERENCE MANUAL ...
Page 2: ......
Page 337: ...442704 A 335 Related topics Sonar views page 326 User interface ...
Page 413: ...442704 A 411 Related topics Menu system page 375 Display menu page 384 Menu system ...
Page 631: ...442704 A 629 Related topics Concept descriptions page 626 Concept descriptions ...
Page 687: ......
Page 688: ... 2021 Kongsberg Maritime ISBN 978 82 8066 211 8 ...
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Page 690: ...Reference Manual Simrad ST90 ...