Flag unavailable-speed, duplicate and position-jump reports in a six-hour AIS feed for 25 vessels and count…

Flag unavailable-speed, duplicate and position-jump reports in a six-hour AIS feed for 25 vessels and count…: a task in pool-desk (Harbor dataset). I'm cleaning a six-hour AIS position feed for 25 vessels before we use it for port-approach statistics, and I need per-vessel counts of the bad reports.