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There are many apps available in the App Store that can read and display GPX files.  Some can also record them for uplaod to the Walkr website.

A well known app for viewing and navigatig using GPX files is GPX Navigator - https://itunes.apple.com/gb/app/gpx-navigator/id581754534?mt=8

Tyoe GPX into the AppStore search bar for the full range.