It has come to my attention that not all GPS units are suitable for wheelchair use. Many devices are designed only to be used in a car driving on the road. The feature you should look for is called "Pedestrian Mode". The reasons for this are quite simple. Cars can be directed to drive on highways - pedestrians cannot. Additionally, cars can only travel in a single direction on one way streets. Pedestrians do not have to be concerned with that. If your GPS navigation device does not have a "Pedestrian Mode", the directions often won't make sense.