Global Positioning Widget for WordPress

Hello,

I was wondering if a Location Positioning(GPS) widget exists for wordpress. If it does where can I downloaded it from. Basically the widget, when installed it can determine and output onto the website the location from where the Site administrator had last logged in. For example, if the admin of a wordpress site logs in from a city located in Spain, then the widget will record that and output in the sidebar that specific location.

A working example of such code can be found on the couchsurfing.org website.

I will start a travel tour across Africa in a few months, and I would like to use this method to let people know, about my current location. I’m not very skilled in php so any idea on how to write such code would also be useful.

Thank you very much in advance,
Any advice/help very very much appreciated.