I don't yet own a 520, but will probably get one for Christmas.
What does the Live Segments function do in the case of overlapping segments? I can see two scenarios here.
1) Segment #2 is entirely inside segment #1
2) Segment #2 starts after you have started #1, but ends after the end of #1.
I was just anticipating what I might need to do with my 'starred' Strava segments. Thanks.
dave