Unlike Doors Open Ontario sites, which typically benefit from having a street address, many Trails Open Ontario events occur in natural settings or remote locations that can be difficult to find. For this reason, each event listing includes a set of Global Positioning System (GPS) coordinates. GPS uses satellite signals to provide a reliable and standardized means for pinpointing locations anywhere on earth. Before heading out to a Trails Open Ontario event, it is a good idea to check the location of the event using an online mapping website. The most popular sites – Google Maps (maps.google.ca) or Yahoo Maps (ca.maps.yahoo.com) – allow users to enter GPS coordinates directly into the search field instead of street addresses. The results of GPS coordinate searches are precise. For example, the five-decimal GPS coordinates provided for each Trails Open Ontario event are accurate to within one metre. In addition, using the satellite imagery feature of these online mapping websites, you can even see aerial photographs of the exact location where the event will begin!