D in Az***

It was helpful to see where we were at in the park (Glacier) but the majority of time I would look at app it showed like there was a topic that it was narrating but we hear nothing. We verified speaker was turned up. It was very disappointing. We will try again at Yellowstone. I’m not sure if it was because I would switch focus to my iPhone camera so I could take a photo (I didn’t close out this app though). Although when I would shift focus back to this app it would update where we were at but no sound.