Display Heart Rate on Edge 520?

You have to pair your heart rate device to your Edge 520.

I did pair it, but when riding I couldn't see my heart rate on any screens...

What specifically do you mean by:

... I couldn't see my heart rate on any screens...

Is it:

• The Heart Rate data field is blank, not showing any data; or
  
• There is no Heart Rate field displayed on any Data Screen.
  

These are two entirely different things.

The data screens and data fields for each screen are chosen in Settings for each Activity Profile. From the startup screen press the bottom left button to get the menu. From there select Settings->Activity Profiles->select a profile->Data Screens.

To select which Activity Profile will be active press the Context Menu button ( upper right) from the start up screen to get the selection menu. If start is pressed without selecting an Activity Profile it will default to the last active one.

What specifically do you mean by:

Is it:

• The Heart Rate data field is blank, not showing any data; or
  
• There is no Heart Rate field displayed on any Data Screen.
  

These are two entirely different things.

Sorry, right. I couldn't see my Heart Rate on any Data Screens...

Then the answer has been provided by TIGERMOUNTRIDER in post #5 above.

tl;dr version: To see HR displayed, you need to add an HR field to a Data Screen.

Coupling Vivoactive HR - Edge 520

Does someone know if it is possible to couble the new vivoactive HR with Edge 520 so
that Edge 520 shows the heart beat measured at the forearm with vivoactive hr?

Does someone know if it is possible to couble the new vivoactive HR with Edge 520 so
that Edge 520 shows the heart beat measured at the forearm with vivoactive hr?

Vivoactive HR will rebroadcast HR over ANT+ and the Edge 520 is listed as compatible on Garmin website. You'll need to pair it from the sensor menu on Edge 520.