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FitoTrack is a nice open source fitness tracker which shows the path on OpenStreetMap background. It logs position and speed data.
You can create a custom workout which shows you the current speed instead of average.
https://f-droid.org/packages/de.tadris.fitness/
What do you actually need it for?
Just need to know my speed on the tractor so I can accurately measure the amount of fertilizer I put on per acre. I have a simple tractor with no Speedometer so I use my phone to track my mph in order to factor propper spray rate.
Couple that with the map to ensure adequate coverage of my acreage and I've got the necessary tools to ensure that my land is properly maintained.
FitoTrack may be suitable for that.
If the Map is not fitting totally you can even correct it on OpenStreetMap.org by yourself
Yeah, OSM isn't bad, I have dabbled with it a bit on another app I have tried. Thanks for the info!