You created an interesting strawman "driving in another country, on the left side of the road, with no sinage or signage in a different language crossing my fingers that your approval of the Apple Maps is in the right place." It is meaningless, however, as the situation would never occur in real life. I assume you have never actually done this; I have. There aren't many countries where you drive on the left. The most obvious are the English-speaking countries: UK, Ireland, and Australia, and, believe it or not, signs are in plain English. The few other countries, Japan, Thailand, Hong Kong, Macau, India, Nepal and Pakistan all have signs in English also. And the signs in all of those places are excellent, and better than most signs in the US. However, in most of those you would have to be out of your mind to drive yourself.
In addition, You could certainly never safely use the Google Maps app for driving anywhere, either at home or in a foreign country. To use it at all you must tap a button whenever you reach a waypoint or it won't give you the next instruction. Which means you need to take your eyes off the road to watch it while driving so you know when you reach the waypoint, then also take your eyes off the road to read the next instruction. Useless for driving at all. The Apple maps app is actually practical for driving because it DOES give spoken turn-by-turn directions.
In a foreign country, unless you want to pay $thousands for roaming data it is less than useless, as it downloads maps over cellular data. Neither the Google nor the Apple apps are practical for International roaming.
For International travel you need an app that stores maps on the device, such as navigon or tom-tom. Or better yet, a $100 dedicated GPS. For travel in your Home country you can't use the Google App while driving without risking your life and the lives of your fellow drivers. You may not want to use the Apple; that's your choice; there are plenty of others you can use. BTW, all of them will have errors. Even Google.
