Average speed to two decimal places

Years ago a Former Member wrote a bit of code and had it for download as averagespeed.prg.  It was to be copied to the Garmin/Apps folder.  Then there would be an option to choose that data field for a data screen in an activity profile.  It worked perfectly on my Edge 830 but the same process does not work on the 850.  I really like to watch my average speed to two decimal places on some rides I do often.  I know there are IQ apps that can be used to program all sorts of things but does anyone have a simple way to just get an average speed to two deimal places data field on the 850?