Google “My Maps” on the iPhone
The Google Maps app is unable to tap into "My Maps". This service gives you access to your maps, on your iPhone.
• no need to install another app: it is just a web page
• keep your Google password to yourself: you only grant access to your maps
Those pages are meant for browsing by an iPhone, and won't be fully functional on a desktop computer. But you can test-drive it using a WebKit browser like Safari or Google Chrome.
For easy access: in Mobile Safari, add a bookmark or to home screen!
Known limitations: lines and shapes cannot be oppened in the iPhone native Maps app. Description support is limited.
Problems? Questions? Suggestions? Send a message to the support page.