Thanks, gkuenning, but I tried all those options to no avail, except the 'unblank screen' - I will try that today.
Last week, when I needed Mappero, I already did put Autocenter I on lat/long and 'display lit when charging', but that did not give the wanted result, and a moment ago I saw that Autocenter was put back to off without me touching it.

I suspect that there may be another setting somewhere in mappero that resets autocenter when twiddled.

Paai