I found this.. any good?
Maverick: Setting up offline maps
Maverick automatically cached map after downloading. For a small area, just connect to Wi-Fi and scroll map to place you are planning to visit. Every downloaded tile saved to SD card and will be available without Internet connection.
SQLite support is coming soon. Right now FAT 32 with 2048 bytes cluster size is recommended format for SD card, since maps are stored in many small files.
1. Download maps with Atlas Creator. YouTube video guide: TrekBuddy Atlas Creator 1.6 beta 1 - YouTube
2. Copy maps to SD card while keeping the following folders structure:
Complete folder structure:
photos in jpg format
/your_map_name - Any map mame since Maverick Pro 2.0
/Custom 2 - Custom maps since Maverick Pro 1.8
tracks in gpx format
Also supported: Ovi/Nokia, Multimap UK, Outdooractive (Germany, Austria, South Tyrol), Cykloatlas (Czech Republic, Slovakia) maps. Just copy atlas folder to maverick/tiles.
3. Select the appropriate map by tapping on the Maps button in the top left corner.
Map Tile Packs
You can also download complete map tile packs in AndNav format.
To convert these maps for use in Maverick:
Download and install Extension Changer.
Right click on folder and select Edit the Extension.
Click Yes when asked to include subfolders.
Enter tile as extension and click Change.
Copy maps to SD (step 2).
I think you can also "save" google maps for offline use .