Hello, thank you for reply.
I have noticed these fonts for a long time through different versions of igo, (israel, world, pal, etc) and have tried many skins / themes.
Has nobody else ever seen them?

They tend to be used to describe an area of interest?? such as golf coarse, airfield etc. rather than specific item like a street name or town. But not always.
Possibly it might be something that appears in certain locations, I have no idea. I'm in UK so use UK / Europe maps.
I haven't tried any others.