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I didn't have any problem following a breadcrumb train on my old 200, but I found navigation was impossible on the 500. Froze all the time. If you ever diverted from the breadcrumb trail it was impossible to find your way back to the route. Maybe I just had a bad one?
520 seems way better in this respect. Garmin's basemaps are next to useless but you can use OSM on the 520 provided you don't need to cover a massive area (you're limited to the 90mb or so that is free in the internal storage, which is good enough provided you're not planning a big tour with no access to a computer to swap maps around).
Other than that, in terms of function (and discounting the bluetooth connectivity/strava racing), it seems pretty similar to the 500.
i have edge 500, is the edge 520 worth a buy ?
....dont have no smartphone or such device, so all the live feeds are useless....