When the map was created Britain would have featured on the first section, which has not survived. All that remains is this tantalizing corner of the south coast of England. From top to bottom the six 'twin towers' represent the present-day towns of Thetford (or Norwich), Richborough, Dover, Canterbury, Lympne and Exeter. A Channel crossing was then necessary to continue the journey to Rome. It is perhaps surprising that 'Camuloduno' (Colchester), which was one of the most important Roman towns in the area, is not accorded 'twin tower' status. Its name is simply written in alongside the road. This may provide a clue to this map's intended purpose. As with today's maps, the features that are chosen for inclusion and those that are omitted are determined by its function. For this reason the lack of significance given to a number of major legionary centres has led to the conclusion that this was not, primarily, a military map.