Page 17 - Electronic Navigation Cyber Book

CONTROLS

An echo sounder will normally have the following controls:

ECHO SOUNDER CONTROLS
1. Mains
2. Dimmer
3. Range/Phasing/ scale
4. Gain
5. Other controls
6. Speed control
7. Zero adjustment/Draught setting
8. Change over transducer
9. Minimum depth alarm
10. PULSE length
11. The number of pulses per sec.

Range Switch – to select the range between which the depth is be
checked e.g. 0- 50 m, 1 – 100 m, 100 – 200 m etc. Always check the
lowest range first before shifting to a higher range.

Unit selector switch – to select the unit feet, fathoms or meter as required.
Gain switch – to be adjusted such that the clearest echo line is recorded
on the paper.

Paper speed control – to select the speed of the paper – usually two
speeds available.
Zero Adjustment or Draught setting control – the echo sounder will
normally display the depth below the keel. This switch can be used to
feed the ship’s draught such that the echo sounder will display the total
sea depth. This switch is also used to adjust the start of the transmission
of the sound pulse to be in line with the zero of the scale in use.

Fix or event marker - this button is used to draw a line on the paper as a
mark to indicate certain time e.g. passing a navigational mark, when a
position is plotted on the chart etc.
Transducer changeover switch – in case vessel has more than one
switch e.g. forward and aft transducer.

Dimmer – to illuminate the display as required.

© 2018 Digital Galaxy Index 17