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Second is the GNSS which should be aligned with the vessel centreline, but could be a few degrees off
And finally, there is the Signature sensor which by default has 45 degrees offset if installed according to the
instructions in
‘Installation’ chapter. It is worth noting that the Signature sensor is essentially mounted
‘upside-down’. The offset as entered in the software is the rotation as related to the vessel, so it is minus 45
degrees in this case.
Figure 28 Signature and GNSS mounting coordinates
To illustrate the GNSS orientation offset it shown here at 10 degrees as an example. This offset should be
as small as possible, and only if it is not possible to get it exactly to 0 correct it in the software.
6.2 Horizontal and vertical offsets
The easiest way to have everything aligned is to mount the Signature and GNSS on a single pole so they
are on the same vertical axis, as shown in the image above. This way there is no need to enter X and Y
offsets.
If, however this is not possible, X Y and Z offsets may have to be entered like in the example below where
the GNSS is mounted on the roof of the vessel. When entering X,Y and Z offsets it is important to start from
Signature mounted in frame,
bottom view.
