The polar v650 is a gps bike computer made for serious cyclists get the detailed data and guidance you need to make the most of your training put yourself on the map with openstreetmap support you can download the map data for the area you are riding in and see your exact location in real time powered by collaboration over 2 million registered users worldwide expand and update openstreetmap data daily large map area the v650 downloads map data in blocks of 450 x 450 kilometers at a time