Upd. for v.2.4.3: Crashes on launch in iOS 5.1.1. In iOS 7.1.2 works fine. Crashes when trying to save track found through "Navigate". (on iPad 3, iOS 5.1.1 and on iPhone 4, iOS 5.1.1)
Lucifugum about Wikiloc Outdoor Navigation GPS, v2.4.4