dynamically updating maps

I'm hoping to use nicemap, or if I absolutely have to, gmap in order to display information from my activity feed. That is, people do something on my site, if i know their location, the map updates immediately, live. No reloading.

Where can I find information on doing something like this?

http://www.thisnext.com/activity/map/

I really hate how gmap moves and scrolls and generally looks clunky. nicemap is much nicer. just don't know if this is possible with nicemap!