Ideally, the XGPS160 should be mounted on the top of your helmet with the antenna pointing directly at the sky. This provides the highest quality GPS data and lowers the risk of your GPS receiver getting lost or damaged.
If you cannot mount it on the helmet due to a variety of reasons (primarily rule changes). We recommend the front fender as a secondary location. Make sure to thoroughly clean any mounting surface with contact cleaner or alcohol first before applying velcro.