1. Select a map on the screen- either half or whole. 2. Turn the radio on. 3 find the button bottom right of the screen that says "Mode" on the left and has a picture of a radio on the right. 4. Press this button briefly ON THE RIGHT HAND HALF (ie rock it to the right) and the screen changes from radio/Tape/CD (as selected already) to the map!! Tap it again, and the screen returns to radio etc etc etc.