5.1 The system should be so designed that neither
the method of attachment of parts of the equipment to the ship nor
damage occurring to any part of the equipment which penetrates the
hull could result in the ingress of water to the ship.
5.2 Where any part of the system is designed to
extend from and retract into the hull of the ship, the design should
ensure that it can be extended, operated normally and retracted at
all speeds up to the maximum speed of the ship. Its extended and retracted
positions should be clearly indicated at the display position.
5.3 If ships are required to carry speed logs
measuring speed through the water and speed over the ground, these
speed logs should be provided by two separate devices.