Adequate back-up arrangements should be provided to ensure
safe navigation in case of an ECDIS failure; see appendix 6.
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.1 Facilities enabling a safe take-over of the
ECDIS functions should be provided in order to ensure that an ECDIS
failure does not develop into a critical situation.
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.2 A back-up arrangement should provide means
of safe navigation for the remaining part of a voyage in the case
of an ECDIS failure.