Wind
MHU (Masthead unit) alignment
This provides an off set calibration in degrees to compensate for any
mechanical misalignment between the masthead unit and the
center line of the vessel.
To check the masthead unit alignment error we recommend you
use the following method which involves a sailing trial:
• Sail on a starboard tack on a close hauled course and record the
wind angle, then repeat the process on a port tack
• Divide the difference between the two recorded numbers and
enter this as the wind angle off set
If the starboard apparent wind angle is greater than the port angle,
then divide the difference by 2 and enter this as a negative offset.
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.
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Software setup| AP44 Operator Manual
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