Garmin Edge 130 Plus: "Grade"?
In the manual of my Garmin Edge 130 Plus, there's an illustration of the screen showing a measurement of "grade" (ie - realtime ascent/descent rate).
I've gone thru all of the options on my Edge 130 Plus and can't find an option for this anywhere (although it DOES show current elevation - but that's not the same as "grade"). Can anyone explain how to activate the "grade" on the display screen? Do I need an optional sensor of some kind to get this to work? I'd certainly find this information in realtime useful.
Thanks!
Bert