--- record and show the geographical locations during a tour (walking, cycling, skiing ...)
--- import of GPS-tracks as GPX-file
--- "Send to FollowMe" for tour plans in GPX format
--- simultaneously painting of a preloaded track and the actual track
--- instant sending of GPS-coordinates (z.B. per Mail, WhatsApp, Threema, AirDrop)
--- instant transmission of GPS-coordinates as google-maps-link
--- photo-, video- and audio-snapshots, linked with the snapshot-location within track
--- edit-mode for tour data like label and type
--- export of photo- video- and audio-snapshots (z.B. per Mail, WhatsApp, Threema, AirDrop, ...)
--- export of reusable GPS-tracks as GPX-file
--- permanent location transmission per iCloud
--- observe tracks (FollowFriend) per iCloud