Google Maps can not be tabbed, never. If they are tabbed the map doesn't show. Only a grey zone shows.
You don't have to explain anything the map does it for you, a notice says:
" Click the map at your current location "
- Need help? Post the URL of the related page (eventualy as confidential info), it will help solve your issue faster.
- An error, notice or warning? report the exact message including the line number
- If you get a white page , enable error reporting and / or check your server error logs.