There are many websites you can use to create, track, and find routes. Here are just a few.
GAIA – Your best option as a back up to your GPS unit.
MapMyRide – One of many great resources for creating your own route.
BikeMap.net – Created by enthusiast cyclists with the goal of sharing awesome bike tours with other cyclists. Now with more than 1,000,000 registered users.
Google Earth – Do you need words here…
Ride With GPS – Empowering people to get outside, reconnect with nature, and embark on two-wheeled adventures.
MTBProject – User submitted trails and information database of mountain bike trails.
Trail Forks – Trailforks is a mountain bike trail database & management system for riders, builders & trail associations.