During training beware of spending too much on electronicky gadgets!
Moving map systems and GPS tracking are a bit of a moving target. Usually one jumps forward and is "best choice" for a while, then f***s up and is overtaken by somebody on the fast lane. When I started flying with iOS devices there was AirNavigationPro definitely in front (and quite affordable when only using the application and openstreet maps), then ANP was trying too much too fast and had serious issues, so Skydemon could outstrip it. Currently Skydemon is still first choice for VFR, but only with a very very very thin advantage over upcoming Jeppesen with its Version 2 of MobileFliteDeckVFR. There is neither the most affordable nor the premium moving map system in Europe, so far (different from the US, where Foreflight is now Gold standard).
For recording training sessions, meaning the device sits somewhere in the back and does nothing but track, I would be lazy and take the base version of ANP, still, or some cheapo geocaching tracking app.