The plugin tries to geolocate visitors of your site using hostip.info and shows the latest 200 in real-time using the google maps api.
Maps can be inserted at any place using the “shortcodes” system in WordPress 2.5 and up.
If the IP address is already logged once it will not lookup the geo data again to speed up things. The main search engines are mapped under one IP address to avoid a lot of loggings for the same bot.