Question 920Navigation General

The correct answer is C) 12 hours. ECDIS (Electronic Chart Display and Information System) is required to have the capability to preserve the record of the voyage track for the previous 12 hours. This requirement is specified in the International Maritime Organization (IMO) Performance Standards for ECDIS, which set the minimum standards for ECDIS functionality and capabilities. The other options are incorrect because 4 hours (A) and 6 hours (B) are not sufficient to meet the IMO standards, and 24 hours (D) is not the minimum requirement.