TRAIL: A SHIP-TRAILING MODEL

This Research Contribution describes a methodology for assessing enemy ability to trail friendly ships at sea. It consists of four parts. The first part treats the search for a lost quarry by shipborne helicopter or long-range reconnaissance aircraft. The second describes a Markov model yielding the fraction of time the ship is free of trail. The third part estimates enemy aircraft requirements to achieve specific search results. The last part presents and documents an APL program, TRAIL, that performs all required calculations.