Trails Offroad requires precise location to work correctly when you are out on the trail. This question is asked when you first open the app and will appear as such:
To make sure this setting is enabled for Android:
Go to Settings > Location > TrailsOffroad and make sure "Allow only while using the app" and "Use precise location" are turned on.
For iOS:
Go to Settings > Location > TrailsOffroad and make sure "While Using the App" and "Precise Location" are turned on.