About The Automatic Range Mode - Marport CATCH User Manual

Important: Pulse length is an important setting for the calibration of the
sensor. If you change the pulse length on a sensor calibrated for target
strength, you need to calibrate the sensor again.
6. Select a TVG setting to compensate the signal loss in water and have targets or
sea bottom displayed in the same color on the echogram, whatever the distance
from the sensor:
◦ 20 log: focus on bottom or school of fish.
◦ 40 log: focus on individual targets.
◦ 30 log: compromise between the two above settings.
7. Do not modify the other echo sounder settings.

About the Automatic Range Mode

The sensor has an automatic range mode that is useful to get better quality echograms
when the trawl is close to the bottom.
The range influences the display of echogram images. The smaller the range, the
shorter the listening time, which gives better quality images. But the bigger the range is,
the lesser the image quality is, because data arrives slower.
You can activate the automatic range mode if you need to get better quality echograms
when the trawl is close to the bottom. This mode is recommended when bottom
trawling.
Principle
Catch Navigator | V1 | Sensor Configuration
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