 To solve the problem, start from the evening position ("A" on the map) and treat the distance between the ship and the landmark (length "AB") as the intended course, and the actual route of the ship (NW) as a deviation.To figure out the distance of the landmark from the ship's position in the morning ("C") is a matter of treating the distance "BC" as the calculated ritorno.Since we need to know the alargar to calculate the ritorno, this is a two-step procedure.