Determine and understand the position-fix systems that feed the ECDIS. Determine the method of switching between sources, such as primary and secondary position-fix systems.
Determine what other systems feed into the ECDIS, such as radar (acquired targets, Radar picture overlay), AIS, water speed logs, echo sounders, etc. For each, establish the reference framework, eg. ground-, water- or ship- stabilised (relative).
Determine where to find maintenance records related to the ECDIS and service reports, non-conformity reports & inspection, validation reports (if appropriate).
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