Koden ESR-145, Operation Manual

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SONAR SYSTEM SUMMARY
An echo sounder is only able to search in one direction within some beam angle, beneath
the ship. A sonar, however, can freely search the broad range, since the
transducer’s
angle can be varied not only the horizontal direction but also the vertical direction.
By changing the horizontal angle (Sector), the various ranges from the narrow to the full
circle are available
By changing the
transducer’s directional angle (Tilt), the ultra-sound beam angle can
be varied from right beneath the ship to the horizontal direction.