Disclaimer: Currently, we do not support the transfer of maps from one device to another in any way, officially or unofficially. If you would like to try using iFunBox, you do so at your own risk!
Okay that said, you can find all maps, guides, and other content in Library/Private Documents/Data. If you want to transfer from one device to another you must copy the entire Data folder over and not try to copy only a portion of it! Additionally, you must copy over the app’s settings file found at Library/Preferences/com.geomagik.pocketearth.plist
Note: All user data (everything in the Favorites lists) is located in Library/Private Documents/UDB. You’d be best off using the built-in ‘PocketEarth Archive’ export/import functionality to sync your devices.