Kongsberg EA640, Installation Manual

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Compass deviation requirements
EA640 units that are installed on the bridge may have an effect on the compass.
Once the installation is complete, the vessel must be swung with the EA640 in both
operative and inoperative modes.
The shipowner and captain are responsible for updating the compass deviation table
accordingly with regard to the vessel’s national registry and corresponding maritime
authority.
Noise sources
The operational performance of the EA640 Hydrographic single beam echo sounder
depends on the noise conditions. It is essential that the noise signature is as low as
possible.
The vessel’s hull, rudder(s) and propeller(s) must be thoroughly inspected in dry dock
prior to installation.
Roughness below the water-line deformities in the shell plating and protruding obstacles
can create underwater noise. These sources of turbulence must be smoothed or removed
as best as possible.
Note
It is especially important that the propeller(s) are not pitted or damaged.
Network security
If a EA640 system is connected to a local area network, data security is important.
Equipment manufactured by Kongsberg Maritime is frequently connected to the vessel's
local area network (LAN). When you connect a computer to a local area network you
will always expose the data on that computer. All other computers connected to the same
network may be able to access your data. Several threats may immediately occur:
• Remote computers can read the data.
• Remote computers can change the data.
• Remote computers can change the behaviour of the computer, for example by
installing unwanted software.
Usually, two parameters are used to define the threat level:
1 The likelihood that any remote connection will do any of the above.
2 The damage done if a remote connection succeeds doing this.
Kongsberg Maritime has no information regarding the complete system installation on
any vessel. Systems provided by Kongsberg Maritime are regarded as stand-alone offline
EA640 Installation Manual