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Note: This is harder than
it looks!
Travelling with the tide/
wind/swell (whichever
has the biggest effect on
the ships course over
ground if they are in
different directions) on
the first pass will make
things much easier.
Doc. P/N:
WSP-009-002
Version:
V2.3
Issue Date:
July 2014
Installation Manual
Sea Trial - Commissioning Step 12 : Patch Test (Roll)
Carry out the following patch test. This test has been automated and the software
will calculate the value of roll correction and store this value. Before proceeding,
check and confirm that there is a tick in the "Use Patch Roll" box, Ship Setup
Options -Sensor Values tab. See Figure 34.
It can be quite hard to perform a patch test in some vessels. Generally the more
room you have, the easier it will be to get the paths overlapping in exactly opposite
directions. Look at the screen shots in Figure 33 for guidance. Note: The patch
testing needs to be performed at a depth of at least 15 metres over an area of
smooth flat sea-floor.
1)
Set the screen display (user interface) to contour view.
2)
Find a straight clear area of water at least a 500 metres long.
3)
In the System Configuration Utility, click on the box marked "Patch Test" and
follow the instructions on the bottom of the screen.
4)
Drive the vessel at a constant heading for a few hundred metres until the
Patch Test screen requests a 180 degree turn.
5)
Turn the vessel around and head down the exact same path in the opposite
direction. Use the Contour view to assist and note the course information
shown on the bottom of the screen.
6)
Follow the previous track as close as possible until you reach the point you
started the first line from. At this time the prompt information on the bottom
of the screen will advise that the patch test is complete.
7)
Exit the Patch Test and check in the Ship Set-Up Options Screen under
Sensor Values that a value for "Roll Correction" has been saved - See
Figure 35.
1. FIRST PASS
3. SECOND PASS
Figure 35 – Example Patch Test Screen Shots
www.wassp.com
2. TURN
4. ENDING SECOND PASS
Page 55 of 68
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