Koden ESR-145, Operation Manual

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SONAR SYSTEM SUMMARY
BOTTOM SCAN MODE
When this mode is selected, the transmitter/
receiver does not rotate like a sonar, but
sweeps from side to side like a pendulum
when the sound wave is emitted.
The reflected echo from the sea
bottom is displayed on the screen
sequentially.
When the bottom scan mode is selected,
it sweeps from side to side in the step set
with STEP on MENU - DISP ITEM SEL.
Changing the sector angle makes it
possible to detect the wider or narrower
range as desired.
The center direction of the sounding beam
can be changed with the tilt angle.
Choose the setting of the tilt angle which
places the sector center in the middle of the
detection range.
In the bottom scan mode the detectable
direction is provided not only rightward
or leftward, but also in the direction of
360° by setting the direction of the transducer.