Change map zoom level based on URL arguments

Is it possible to display different maps (in a view) based on the view arguments?

Example: I create a view with style GMap showing the locations of all nodes. I add the country name as an argument in the view so the URL would look something like: 'example.com/node_map/australia'. The map would be zoomed in on Australia (though you could still drag it around to view other countries/nodes). Changing the country name in the URL would change the initial zoomed-in area of the map.

To do this, I figure you'd have to use a GMap macro by changing the 'center' and 'zoom' values, but I don't know how to change these based on the argument, or how to specify the different values for different arguments/countries...
Ideas?