If you use GSAK, you can tweak it to enter hints into the notes section of your ETREX. It's not ideal, but it will work. Also, you can, as somoene else mentioned, load the PQ and use the gps offline. Finally, you can call your provider and get a roaming plan for one month. We're traveling to the US next month and that's our plan - for $10 I can get a data plan for 30 days that gives me a MB for $1. Those are two great cities for visiting and for caching - have fun!!