It is supported by all major browsers, and also by IE 7 (browsers that does not support geolocation only show other visitors’ position);
Easy to custom, thanks to the offline documentation and to the offline generator code;
You can change: background color, map appareance, mark icon and speed too;
The package includes also two .psd files to custom even more it;
Possibility of edit the mark icon just uploading the mark icon which you prefer on your site!
You can set as maximum (suggested) height 600 px, and as width 1200 px.
Map images from NASA.