Simrad is42 - Automatic calibration

If the port angle is greater than the starboard then divide the
difference by 2 and enter this as a positive offset.
Enter the offset it into the MHU Align calibration field.
Depth
Depth offset
All transducers measure water depth from the transducer to the
bottom. As a result, water depth readings do not account for the
distance from the transducer to the lowest point of the boat (for
example; bottom of the keel, rudder, or propeller) in the water or
from the transducer to the water surface.
• For depth below keel (A): Set the distance from transducer to the
bottom of the keel as a negative value. For example, -2.0.
• For depth below transducer (B): no offset required.
• For depth below surface (waterline) (C): Set the distance from
transducer to the surface as a positive value. For example,+0.5.
A B C
+0.5
+0.0
-2.0
Aft depth offset
This option allows the system to display two depth readings.
The Aft depth is calibrated in the same manner as the Depth offset.
Ú
Note: Aft Depth is only available when a valid signal is received
from a second and compatible NMEA 2000 or NMEA 0183
device.
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Software setup | IS42 Operator Manual