Display current speed in OsmAnd
In OsmAnd:


Open the navigation drawer (swipe from left or bottom left button)
“Configure screen” (Gear icon)
“Right panel” should have a line for “Speed”, tick that.


The speed will be shown, somewhat small, in the top right list. I think standard is to show only the number of satellites, but there are a few items that can be shown there.

Eta:
I also set “Trasparent skin” at the bottom of the “Configure screen” list. Makes the speed &amp;c. a bit less obtrusive.