CycleBike is a nifty hands-free navigation app that uses GPS to follow a specified route. You can follow routes from "RideWithGPS", Strava, bikemap.net, BikeRouteToaster, GPSies, MapMyRide and others, loaded onto your Android phone. No data connection is needed to navigate.

The scrolling display features
turn arrows
street name
distance to the next turn
bearing to the next way point

A ride computer shows
distance
speed
ride time

Totally-free:
No ads, pop-up windows, or web-links to clutter up your precious screen real-estate.
No disabled features, or limited access, no monthly fee; this app is totally free for life.

Hands-free:
Auto-scrolling as each way point is reached.
Large, bright text to quickly read the next turn.
Visible warning as each way point approaches.
Don't fumble with your GPS as you're trying to ride.
Give up on those printed route sheets in 9-point font, that get wet, torn, and lost.

Both Route and Track files are accepted and will be merged together if both are present in the file. Settings menu allows Track Point density adjustment.