As long as we are looking at every spec of dust. To the right of the ammo count in the holographic sight there is a circle with a triangle on top. In the "Building the Destiny E3 Reveal" video we see the triangle move as the player turns. Could this be some kind of in sight radar or compass? I haven't seen a red dot on it yet, but it does move as the player moves. It moves at around 4:19 in the video and again at 4:53.