Make your own maps
Creating custom Garmin and Magellan compatible GPS maps? Listed here are many links for helping you develop professional quality maps for fun and profit. travelbygps.com
DCT from Canada:
"I just got my Nuvi a couple of days ago, used Metrowizz and made up 476 megs of Europe maps. Thats way more than I will need for my vacation. I copied the file as suggested into the Garmin directory on the Nuvi...works great. Thanks for Metrowizz and your help in getting it up and running. I changed my location to places I will be staying in Europe and it routes to my destination with street names and turns called out. Garmin makes great products, you make them work better. Thank you!"
Anonymous on MetroGold:
"Outstanding Product - worth its weight in Gold!
This is just a terrific addition that makes the Garmin Etrex a great little GPS instead of just an ok device. For $6 (US) it cannot be beat. I certainly hope they continue to create products that support the Garmin GPS portfolio. Well done guys!"
Free Mapcenter 
