Given this review: "OUTSTANDING!!!!! I gotta giv this app the full 5 star treatment. Though I don't use it in flight. It is very useful on the ground. Especially for teaching students. Plus it's FREE! How can anyone complain about something that doesn't cost them anything? Oh wait I remember. It's 2015." Would you recommend this app to a friend? Not at all, No, Maybe, Yes, or Definitely?

Definitely