Chapter 6 Deploying Wireless Networks for FortiOS 5.0 : Configuring a WiFi LAN : Setting your geographic location
  
Setting your geographic location
The maximum allowed transmitter power and permitted radio channels for Wi-Fi networks depend on the region in which the network is located. By default, the WiFi controller is configured for the United States. If you are located in any other region, you need to set your location before you begin configuring wireless networks.
To change the location setting - CLI
To change the country to France, for example, enter
config wireless-controller setting
set country FR
end
To see the list of country codes, enter a question mark (‘?’) instead of a country code.
 
Before changing the country setting, you must remove all Custom AP profiles. To do this, go to WiFi Controller > WiFi Network > Custom AP Profile.