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

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The gyrocompass is designed to work trouble free in Area A classified
locations according to Germanischer Lloyd vibration level classification,
see also ”Vibration” on page 1-14 for details.
The gyrocompass will show best operational performance if minimal
vibration levels are kept at place of installation.
Installing the gyrocompass in the engine room is not recommended and
should always be avoided if possible, as engine rooms are usually clas-
sified as Area B location, according to Germanischer Lloyd vibration
level classification.
An installing position directly on the vessel´s deck structure is always
preferable to minimise possible vibration levels.