The GPS positioning accuracy is degraded by many factors such as satellite signal blockage because of buildings, trees, bridges, indoor, basement, etc. In order to show accurate location Trakbond device needs to receive GPS signals from at-least 4 satellites. But when the device is indoors (inside home, school, etc.), the device may not receive signal from any GPS satellites. In such cases, you might see slightly inaccurate location when the device is not receiving GPS signal.