Using this on 4.3 and my overall CSS gets completely whacked out. Have you tested it on 4.3 yet?
Yup, Google Maps requires an internet connection.
+1 works on 4.3. but if you don't have an internet connection, you'll get errors.
What build and client OS/browser are you using? Just tried it with 4.3 beta build 111122 in Firefox and Safari and it seems to work fine.