NAVIS NavDP 4000. Operation Manual
Chapter 10
System Functions
– Thrust Ability Diagram — see Section 6.1.2, page 102,
– Minimal Power Heading — see Section 10.3, page 176,
– Hold Area — see Section 10.4, page 178
– Target Following — see Section 10.5, page 180,
– Tracking (Low Speed and High Speed) — see Section 10.6, page 189,
– Autopilot Function — see Section 10.7, page 201,
– Capability Analysis — see Section 10.8, page 207,
– Drift Analysis — see Section 10.9, page 218,
– Consequence Analysis — see Section 10.10, page 227,
– Temperature Monitoring — see Section 10.11, page 231,
– System Monitor — see Section 10.12, page 232,
– Status Page Printing — see Section 10.13, page 239.
10.1
Remote Center of Rotation (Pivot Point)
When using dynamic positioning, the operator has the ability to alter the point at which the vessel rotates around.
Normally this point is located at the Center of Gravity. When a heading change is carried out the vessel will spin “on a
dime”, staying relatively in the same position.
The operator may choose to change the center of rotation for a number of reasons related to the operation currently
underway. Some examples of changing the COR:
– to the position of a crane wire that is connected subsea, so that a change in heading doesn’t pull laterally on the
load;
– to the location of the diving bell, so that a rotation does not move the dive bell closer to a subsea structure;
– to the roberts hoop, so that a change in heading does not pull the diver into danger;
– to the tip of a pipe lay stinger so that you can adjust to the best weather heading, without changing the location of
the tip in relation to the survey line;
– off the vessels bow centered on a spar, so that the vessel rotates around that spar while maintaining a constant
distance (weather vane).
Use the
FUNC
panel to select these functions (see Figure 10.1):
These functions can be used for different operational modes. In this section you learn how each of the functions relates
to a particular operational mode.
This function is used in
IJ
and
DP
mode only. A default COR position is in the center of gravity. If COR is set at the
center of gravity, the
remote COR
softkey is dark, otherwise it is lit up. Press the
remote COR
softkey.
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