I now have gosmore running on my TGPS 375 with a map of Pretoria and Johannesburg. It's already quite pretty and will look even better with rotated text. Then I'll be able to easily verify the map as I go.

The TPGS 375 is an entry level SatNav device running WinCE 4.2 that should cost no more than R1,000 = Euro 100, if you can still find it in the stores.