When following a route on the 935, it's possible to enable a Data Field on the Map Screen (Settings - Navigation - Data Screens - Map - Data Field). By default, this will be the remaining distance for the route. Is it possible to have another metric shown instead? (for example Pace or Lap Pace). It seems weird that almost all screens are customizable but not this one.
Definitely, I have mine set to power. Start an activity, then go into the activity settings screen (hold down on the middle button and then navigate to it). From there just go to configure data screens and choose which field to use.
I did need to enable the map as a data screen in the Run Settings (so seperate from the Navigation settings) and then I could edit the fields. This does mean that the map screen will always be there (even when not following a route) but that is not an issue. Great!