Thanks for the notes about audio cues:
I'd like to add a couple of clarifications:
1. Unless you have your own paid RWGPS account, you have to get your routes from the SBH RWGPS library in order to have audio cues. If you obtain your route from your own free library or someone else's library you won't get the audio cues.
2. You don't have to download the route in order to get audio cues (assuming you met #1 above) - you can simply navigate directly from RWGPS. Downloading over wifi ahead of your ride can save a small amount of cellular data. Downloading also makes sure that the route doesn't go silent if you ride out of cell tower range.