A bit of good info from DCR:

how it’s different from the ‘original’ Edge 520 first:

– Added full map set for display of roads/routing

– Added turn by turn navigation capabilities, also route recalculation

– Has Trendline popularity routing engine overlaid atop the new maps

– Added Rider to Rider messaging (introduced on Edge 1030 last summer)

– Added two mountain bike trail apps loaded by default (TrailForks & Yelp)

– Updated Strava Segments algorithm found in Edge 1030 that is more accurate for racing segments

– Added slight differences in data page/field layouts

– Added new Extended Display mode for Garmin FR935/Fenix 5 integration as a secondary display (Edge 820/1030 will get too)

– Beefs up by 2g more than the Edge 520 (63g vs 61g)

But what if you were roughly comparing it to the Edge 820 or Edge 1030? Well, here’s a handful of features that those units have that the Edge 520 doesn’t (beyond the obvious, like a bigger screen):

– Edge 820/1030 has a touch screen, Edge 520/520 Plus doesn’t

– Edge 1030 connects to Bluetooth Smart sensors, Edge 520/520 Plus/820 lack that hardware

– Edge 820/1030 has point of interest database (for things like restaurants, convenience stores, hotels, etc…)

– Edge 820/1030 can route to a specific street address on the unit itself (I.e. 123 Maple Drive, New York, NY), the Edge 520/520 Plus have to have pre-defined routes (Note: The Edge 520/520 Plus can, however, do turn by turn navigation route to previously saved points)

– Edge 820 doesn’t have Trendline popularity routing, Edge 1030 does

– Edge 820/1030 have WiFi, Edge 520 series doesn’t

– Edge 1030 has latest FirstBeat driven recovery and training load metrics, Edge 520/520 Plus only has a limited subset for VO2Max and Recovery Advisor

– Edge 1030 is compatible with secondary battery pack, Edge 520 Plus/820 are not

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