Hi,
I got my new Edge 520 a couple of days ago. I got the head unit only as I already own what I thought would be compatible sensors - I know I should have checked - a Wahoo Tickr HR strap and Garmin GSC-10 speed/cadence sensor. I have two of these on different bikes.
Due to other things, I have not been able to ride with the Edge 520 yet and have only been to set it up and play with it.
Firstly, the Tickr won't connect at all. I saw in another thread that others were having problems. Wahoo support have confirmed there are issues. The Tickr works fine with my old Edge 510, Vivoactive, iPhone etc so the issue seems to be with the Edge 520. I tried with anothe Garmin HR strap and that worked perfectly.
On another forum, I have read that there are issues with the GSC-10 too. My Edge 520 sees and looks like it paired with both of them but as I haven't been able to ride out yet, I don't know what to expect. Anyone using the GSC-10 successfully with Sdge 520?
It sounds like I will be selling things on eBay to fund replacement sensors that have a chance of working with my new Edge 520. Either that or stick with the Edge 510 and live with its random crashes, poor display quality and lack of basemap support.