Description
The physical location of the transducer is important for the echo data accuracy.
Use the centre of the transducer face as reference, and define the offset values related to the Ship Origin. The installation angles relevant for the transducer must also be defined. These values were recorded during the installation, and they define the direction of the transducer face.
NoteIt is very important that the transducer installation angles are measured and recorded accurately during the installation. Incorrect angles will greatly reduce the data accuracy.
A hull unit may be provided as an option. It allows you to lower and hoist the transducer. When this option is selected, the transducer is delivered readily mounted at the lower end of the transducer shaft. Since the transducer is pointing straight forward, the Rotation Around Z value is 0 (zero). However, if the hull unit has been installed with an unintentional rotation referred to the centre line, the Rotation Around Z must be adjusted to compensate for this.
Details
X Offset
Select the offset value on the X axis (fore-and-aft direction) from the Ship Origin. Adjust with a positive value for X if the transducer is located ahead of the ship origin.
Y Offset
Select the offset value on the Y axis (athwartship) from the Ship Origin. Adjust with a positive value for Y if the transducer is located on the starboard side of the ship origin.
Z Offset
Select the offset value on the Z axis (vertical) from the Ship Origin. Adjust with a positive value for Z if the transducer is located under the ship origin.
Rotation Around X
Specify an angle (in degrees) to compensate for any deviation from the X axis (fore-and-aft direction) in the vessel coordinate
system.
Rotation Around Y
Specify an angle (in degrees) to compensate for any deviation from the Y axis (athwartship direction) in the vessel coordinate
system.
Rotation Around Z
Specify an angle (in degrees) to compensate for any deviation from the Z axis (vertical direction) in the vessel coordinate
system.
Example 1
For trawl and navigation use, the transducer must be pointed straight forward with the indicator arrow pointing up.To set the angles correctly, observe this exercise. Use your cellphone to visualize the transducer movements.
|
1 |
Start with the transducer in its default position: The transducer face is horizontal facing down, and the indicator arrow
is pointing straight forward. |
|
2 |
If the transducer is properly installed without unintentional skew, the Rotation Around X can also be set to 0 (zero). |
|
3 |
Lift the front end of the transducer up, so that the indicator arrow moves up. |
|
4 |
Proceed until the requested angle has been reached. Example: If a 30-degree Y angle is requested, the Rotation Around Y must be set to 60 degrees (that is the angle from the default position).
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|
5 |
Since the transducer is pointing straight forward, the Rotation Around Z value is 0 (zero). |
Example 2
For purse seine with the gear on the starboard side, the transducer must be pointed approximately 90 degrees towards starboard with the indicator arrow pointing up. To set the angles correctly, observe this exercise. Use your cellphone to visualize the transducer movements.
|
1 |
Start with the transducer in its default position: The transducer face is horizontal facing down, and the indicator arrow
is pointing straight forward. |
|
2 |
If the transducer is properly installed without unintentional skew, the Rotation Around X can also be set to 0 (zero). |
|
3 |
Lift the front end of the transducer up, so that the indicator arrow moves up. This is a Rotation Around Y. |
|
4 |
Proceed until the requested angle has been reached. Example: If a 15-degree Y angle is requested, the Rotation Around Y must be set to 75 degrees (that is the angle from the default position).
|
|
5 |
From this raised position, turn the transducer towards starboard. The indicator arrow is still pointing up. This is a Rotation Around Z. |
|
6 |
Proceed until the requested angle has been reached. Example: If a 90-degree Z angle is requested, the Rotation Around Z must be set to 90 degrees (that is the angle from the forward position).
|
Example 3
Used for purse seine with the gear on the port side, the transducer must be pointed approximately -90 degrees towards port (or 270 degrees towards starboard which puts you in
the same direction) with the indicator arrow pointing up. To set the angles correctly, observe this exercise. Use your cellphone to visualize the transducer movements.
|
1 |
Start with the transducer in its default position: The transducer face is horizontal facing down, and the indicator arrow
is pointing straight forward. |
|
2 |
If the transducer is properly installed without unintentional skew, the Rotation Around X can also be set to 0 (zero). |
|
3 |
Lift the front end of the transducer up, so that the indicator arrow moves up. |
|
4 |
Proceed until the requested angle has been reached. Example: If a 20-degree Y angle is requested, the Rotation Around Y must be set to 70 degrees (that is the angle from the default position).
|
|
5 |
From this raised position, turn the transducer towards port. The indicator arrow is still pointing up. This is a Rotation Around Z. |
|
6 |
Proceed until the requested angle has been reached. Example: If a -100-degree Z angle is requested, the Rotation Around Z must be set to -100 degrees (that is the angle from the forward position). Setting it to +260 degrees will also work.
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