Don,
We actively pan the position icon to the rear edge of the screen. Once you begin flying you will notice the Airplane position start to pan towards the rearward edge of the screen. It's starts about 15kts and gradually increases. You can experiment with this by entering Simulation Mode. Touch Menu -> About -> GPS Information -> Begin Simulation.
You will get a set of controls to control the aircraft. Increase the speed and you will see this panning effect. Once complete, you can eithe power cycle the unit or use the se sequence to End Simulation. I hope this helps.