Sperry Marine 4914-CA, Operation, Installation And Service Manual

Page: 11 / 192

k^sfd^q u jh N MRSPQPLc
p~ÑÉíó=fåëíêìÅíáçåë ñá
`^rqflk Risk of unstable/unreliable heading in polar waters
When operating the vessel in polar waters, the heading information of
the gyrocompass may become unstable/unreliable resulting in possible
deviation.
For safe steering in polar waters, the heading information of the gyro-
compass may therefore NOT be used for navigation and heading infor-
mation of a GNSS (Global Navigation Satellite System) compass be
preferred instead.
kçíÉ
The definition of polar waters follows E190E IMO Guidelines for ships
operating in polar waters and is illustrated in
‘Polar Waters Definition” on page 1-9.
`^rqflk Risk of damage to the gyrosphere through shut-down
A shut down of the NAVIGAT X MK 1 system, while the vessel is navigat-
ing, will damage the gyrosphere, as the gyrosphere is only self protected
against physical damage, as long as the system is running.
NEVER shut down the NAVIGAT X MK 1, while the vessel is navigating.
A shut down of the NAVIGAT X MK 1 system for good reason is only pos-
sible when the ship is NOT navigating.
kçíÉ
Sperry Marine requires to NOT shut down the NAVIGAT X MK 1 system
as long as the vessel is navigating, even when operating in polar waters
with possible unstable/unreliable heading.
`^rqflk
Risk of damage through overheating
A polluted or clogged air inlet grill located at the back side of the compass
housing will decrease the functionality of the cooling fan and cause over-
heating of the gyrocompass.
Always maintain the required distances around the compass housing to
enable sufficient air supply and full cooling fan functionality.
Make sure to regularly clean the air inlet grill from dust and dirt and check
the fan functionality to avoid overheating.
kçíÉ
A visual inspection of cables and connectors of the gyrocompass should
be carried out regularly to detect any signs of damage or deterioration.
kçíÉ
This Operation, Installation and Service Manual 056343 applies only for
NAVIGAT X MK 1 systems with the new type master PCB and the PCB
transformer on the rear side.
For NAVIGAT X MK 1 systems with the old type master PCB and the PCB
transformer on the front side, only the Operation, Installation and Service
Manual 056310 is applicable.
kçíÉ
In case a „Speed Invalid“ alarm is triggered while the vessel is not in
motion or moving very slowly (e.g. when manoeuvring in harbour), this
is often caused by fast currents of fairway water increasing the - 5.0 kn
minimum speed default value.
In this case, the minimum speed value must be adjusted accordingly.