Navigation app with support of KML / GPX

I have GPX / KML tracks recorded some time ago that show exact route to places deep in forests. While there are multiple roads crossing at different angles following previous track is best solution for not getting lost.

I’m looking for iOS app that will allow me to load tracks (one for every location I need to visit) to memory and display selected track with my current position. Background for map is not really important - there are no forest roads (eastern Europe) on maps (maybe sat images?)

Other problem is that app should not require Internet connection to run (poor reception in forest, edge if lucky)

Can anybody help?