FWIW, the Apple Watch offers this. It buzzes or audibly signals one way for turning left and another for turning right. I use it when walking around a new city sometimes.

I love the idea of the shopping list, though not integration with Amazon or having it automatically progress. It doesn't know where things are in my store (and they change), so that doesn't make sense to me. But having it there and being able to see it without taking out my phone would be nice.