Most models have a front, flank and rear arc based on the direction they are facing. These arcs are used to determine what the model can see, and to determine the direction of an enemy charge.

A model's front, flank and rear arcs extend out from the corners of its base at 45° angles, forming four 90° quadrants, as shown in Fig 103.1 below. A unit's facings are determined by the facing of its constituent models.

Models can only draw a line of sight to things that lie within their 'vision arc'. Unless stated otherwise, models have a 90° vision arc, corresponding to their front arc.