I made an experiment on my Edge 705 a couple of weeks ago, generating some non-ASCII labels in cp1252, and many code points were displayed as a substitution character. I think that it would be useful to test each Garmin code page on as many devices as possible to find out which code points are really supported. I wasn't thinking about character sets, but codepoints for points of interest and road types. It seems to me that the easiest way to achieve this could be to write a script that generates an *.osm file and translate the file with mkgmap. That would also enable some regression testing later, if we archive the generated output. That will only work with POI codepoints that are in the right hand side of the osm->garmin translation tables. I was thinking about being able to explore the entire possible space of garmin values. But perhaps it's well known enough not to be necessary.