Hi... I'm a bit of an expert on both ChatGPT / Generative AI and navigation - basically this has been my career since the 1980s.
In a nutshell, you absolutely do not want to use ChatGPT for this sort of thing. And, to confirm my beliefs, I tried it and ChatGPT even warns you against using it.
The instructions will be wrong in the same way that if you listened to people talking about traveling from point A to point B and tried to make sense of it, you'd get the wrong answer. It might sound (and be) reasonable, but in the end it won't be precise.
Proper navigation requires a specialized planar graph, road impedances & speeds, address to coordinate matching, and most importantly, up to date information about the roads.
Will AI be able to do this in the future? Absolutely, but don't use AI for this yet - you'll end up extremely frustrated.