As we all know that in the middle of the competition of GPS in the world of technology, there are a lot of things in which they are used in order to make the GPS are really great and it has a lot of people who choose to get them. This kind of device is really made in the very smart way in which it gives the best things that you can use for all kinds of activities. The Harman Kardon GPS-500 is really great since it is made in the great design. Along the top of the GPS is the power button as well as an SD card slot. The maps are pre-installed and cover the USA and Canada, so the SD slot is only used if you want to add music or video files. » Read more: The Great GPS of Harman Kardon GPS-500