Map Icon not centered inside Post Tabs

It’s a Google Maps issue – there are some workarounds here:

https://code.google.com/p/wordpress-geo-mashup/issues/detail?id=333

Cool beans.
Post #4 from that link solved my problem.

I spoke too soon, I thought the css fixed my problem but when was browsing other pages, the marker remained half unseen.

However, the solution was really simple.

On the plugin settings, I set up the width in Single Maps to 100% so that it stretches itself to the whole width. I simply changed it to 620px (in my case) and the marker centers itself. No css required.