22 The global cargo ship network FIG. 5: Sample trajectories of (a) a container ship with a regularity index p = 2 . 09, (b) a bulk dry carrier, p = 0 . 098, (c) an oil tanker, p = 1 . 027. In the three trajectories, the numbers and the line thickness indicate the frequency of journeys on each link. (d)-(f) Distribution of p for the three main fleets.