FLIR RAYMARINE A75 WiFi - Sonar Calibration and Interference

15.6 Sonar transducer Calibration
Your sonar transducer must be calibrated correctly
to achieve accurate depth readings.
The multifunction display receives the image from
a sonar module which processes sonar signals
from a transducer mounted in the water. If the
transducer is equipped with a speed paddle wheel
and temperature-sensing thermistor, the sonar
module calculates speed and temperature. To
ensure accurate readings, it may be necessary to
calibrate the transducer(s) by applying offsets to
depth, speed and temperature. As these settings
are held in the sonar module and relate to the
transducer, they are applied system-wide.
Depth Offset
Depths are measured from the transducer to the
bottom, you can apply an offset value to the depth
data, so that the displayed depth reading represents
the depth to the bottom from either the keel (negative
offset) or the waterline (positive offset).
Before attempting to set a waterline or keel
offset, nd out the vertical separation between the
transducer and either the waterline or the bottom
of your vessel’s keel, as appropriate. Then set the
appropriate depth offset value.
1
Waterline offset Values greater than zero (Positive
values) represent a waterline offset
2 Transducer
Zero offset represents the depth
from the transducer’s location
3
Keel offset Values less than zero (Negative
values) represent a keel offset
Setting the depth offset
From the Sonar application:
1. Select Menu.
2. Select Set-up.
3. Select Transducer Set-up.
4. Select Depth Offset.
5. Adjust the offset to the required value.
Remember Negative values represent a keel
offset and positive values represent a waterline
offset.
Setting the speed offset
From the Sonar application:
1. Select Menu.
2. Select Set-up.
3. Select Transducer Set-up.
4. Select Speed Offset.
The speed offset numeric adjust control is
displayed.
5. Adjust the offset to the required value.
Setting the Temperature offset
1. Select Menu.
2. Select Set-up.
3. Select Transducer Set-up.
4. Select Temperature Offset.
The temperature offset numeric adjust control is
displayed.
5. Adjust the offset to the required value.
Sonar (Fishnder) application
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