The CMA-900 FMS units now fitted into our classic 747's has the same set-up. When your flying a sid or star in the map mode, you have a pictorial of the track your supposed to fly anyway, so they give you track to back up with. I like having both to work with , but you have to have your brain engaged. Also, in some parts of the world, we don't have the sids and stars in our data base and then have to go back to the old raw data way of flying.