NAVIS NavDP 4000 Series Operation Manual page 133

Sensors
Note that in case the vessel is under auto heading control the heading either remains as current one or is kept as
previously set one (see Figure 7.8).
Press Hold to keep the vessel in current heading,
Press Previous to rotate the vessel back in order to follow the previously set heading.
Data processing algorithm estimates a standard deviation of measuring noise. This value is taken into consideration
if the filter operates for a long time starting since it has switched on. If the noise value is high (more than 2 degrees) it
is highlighted by red color. Draw your attention to this sensor and monitor the graphs (see Figure 7.9). You should not
select this sensor as the main one.
In case of loosing good data from all of gyrocompasses (it means that course filter is not ready), NAVIS NavDP 4000
can not use data not only from gyrocompasses, but also from reference system and wind sensor. It is due with relationship
between absolute and relative (vessel) coordinate systems: course is the base. There is two steps of indicating:
1. Filter just get into "not ready" state. Messages from reference and wind sensor have not satisfy the accuracy criteria.
2. Filter has "not ready" state more than 3 minutes. Messages have status "Not used", reference and wind sensor are
rejected from the system.
The number of alarms appears (see Appendix B, page 251, Sensors and Ref-systems).
The following parameters are provided for Gyro (see Figure 7.10):
Gyro Correction — value in degrees for Gyro data correction.
Press "Change" softkey to set new correction value.
Doc. 000.JDP-10000-OME, rev.3.3.13/"2102.$–17A-Advanced"
Figure 7.8: Window Remove Bias under Auto Heading Control
Figure 7.9: Gyro Trend view
Figure 7.10: Gyro Parameters
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