I must publicise this brilliant app, from Ulmon (website). t should really be called simply Maps2Go. For Mac iPhone or iPad. Free! You download maps for the city or area you are interested in, and then GPS will show you exactly where you are.
No internet connection needed after the initial map download. Unlike Google maps or Apple maps you never have to wait for the map to be redrawn or find that the map won't redraw because you have no internet connection. The maps are saved on your phone.I have used this app on my iPhone in Spain, in Verona, Italy, in walking round footpaths in deepest rural Wiltshire, UK, and now in Taiwan.
If you are still SatNav free it is invaluable for negotiating motorway interchanges and city streets. It even shows one way street directions. In walking damp, confusing footpaths, equally useful. You do need a map as well to give you the overview, but that little blue blob shows you exactly where you are and which direction you're heading in. Such a comfort!
It's based on maps created by the crowd source OpenStreetMap. Along with whatever maps you want, you get Wiki Plus guides to cities or well known buildings or features.
You can change the scale of the map in the usual way.
Many city maps are already available, and lots of reviewers report that if you ever want a map of a particular city or town you just email them and a couple of days later, there it is.