1. A simulation system, comprising: at least one virtual projectile/missile firing device associated to a determined position, movable directing means arranged to direct a virtual projectile/missile towards a target, and image capturing means arranged to capture at least one image of the scene in front of the directing means, a terrain database comprising positions of landmarks, and processing means arranged to process the image of the scene so as to identify at least one landmark of the terrain database in the image, wherein said processing means further are arranged to determine a compass bearing of the directing means based on at least a position of the virtual projectile/missile and a position of the identified at least one landmark.