Find Maps in Google Drive

Now that custom Google Maps are available in Google Drive, you may wonder how to find them. "My maps" is not included in the list of file types from the advanced search, but you can use the "opens with" feature that was added in the new Google Drive interface. Just click the arrow from the search box, select "Google My Maps" from the "opens with" list and click the search button. Google Drive will display all the maps you've created in Google My Maps. Another option is to search for app:"google my maps".

You can add some keywords to the query to find a map.