Over the years there were requests for UTM support in my MapOSMatic instance every once in a while.
I now spent most of the first day of this years FOSSGIS Summer Camp on the topic, and I’m now happy to announce a first exeprimental implementation of an UTM grid overlay.
The screenshot shows the grid overlay only for clarity, it shows the grid for transition between two UTM zones, and the not-yet-perfect label placing:
If you are interested in further progress on this feature you may wat to subscribe to the Feature Request