Definition
The first stage of passage planning, in which every relevant source is collected and assessed: charts of suitable scale and known datum, pilots and sailing directions, tide tables and tidal stream atlases, light lists, notices to mariners, routeing measures and reporting schemes, climatology and current forecasts, together with the vessel's draught, endurance, equipment and crew experience. Its output is a decision on feasibility and broad route options, not yet a detailed track.
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