Use Edit a Trail to update (correct or add to) a trail that you have defined.
In Online Map you can find maps that are available in the area shown in the screen, or find all Public maps that have been defined. You can choose to have your geolocation tracked automatically and receive warnings on your phone if you are off the trail. Alternatively you can choose to check you geolocation on the trail manually when you want to. If you are off trail, the map shows the shortest distance back. You can also choose to save a trail to your phone's storage so that you can view the trail when there is no Internet access,
In Offline Map, you can view the trails the you have saved to your phone.