Every vessel should carry nautical charts and nautical publications
to plan and display the ship's route for the intended voyage and to
plot and monitor positions throughout the voyage.
An approved electronic chart display and information system
(ECDIS) may be accepted as meeting these chart carriage requirements.
Back-up arrangements to meet these functional requirements
should be provided where this function is partly or fully filled by
electronic means: this means single ECDIS and paper charts or duplicate
ECDIS.