I teach NJROTC in high school and we have an orienteering team. So we do land navigation, map reading and compass skills. We also have a marksmanship team and we shoot air rifles competitively. Schools still teach stuff like that but you have to get in the right program.

As to the "app". I don't have a smart phone, I don't need a smart phone and I don't want a smart phone. So, NO I haven't used it.