Gaia GPS is used after registering on the site on any device. You get access to a huge number of off-town roads for travel. In an application I usually find the desired terrain, download a map, and create a route of interest to me. It's great that the map can be used offline. This is the mode that I use Gaia most often, and I don't always need to be connected to the network in order not to lose track of an unfamiliar route.