Appendix C: Sonar
149
Appendix C: Sonar
Introduction
The sonar provides a detailed underwater view that helps you to see bottom
structure and texture, underwater obstructions such as wrecks and fish. Depth
data is also provided and depth and temperature alarms can be set.
How the sonar works
The sonar application uses a Digital Sounder Module (DSM) to process sonar
signals from a suitable transducer and provide a detailed underwater view.
The transducer located on the bottom of the boat sends pulses of sound waves
into the water and measures the time it takes for the sound wave to travel to the
bottom and back. The returning sound echoes are affected by bottom structure
and any other objects in their path, e.g. wrecks, reefs and fish.
The DSM processes these echoes and sends data to the sonar which displays a
visual interpretation of the underwater view. The strength of echoes is indicated
on the display by different colors. You can use this information to determine the
bottom structure, the size of fish and other objects in the water, e.g. debris or air
bubbles.
Bottom indications
The bottom usually produces a strong echo, enabling the sonar to see great detail.
A hard bottom, such as sand, produces a thin line.
A softer bottom covered with seaweed produces a wide line, as the sound waves
reflect from different layers of the bottom. In this image the sonar is getting a
good echo from the bottom, so the upper layer of the bottom is shown as dark
gray.
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Summary of Contents for H6
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