A great thing about Gaia is the ability to import gpx files into the app. I found an easy way to do this on the iPhone or iPad without having to use a computer.
There’s an app called good reader that allows you to login into a web site and download files (like backpacker.com or every trail) you can then email the gpx files within good reader to firstname.lastname@example.org.
This works great and is pretty easy. No need to use a computer any more.