Stop nagging for a Wifi connection

In OS X, turn of the automatic joining of Wifi networks, and thus the scanning if one is available, in order to save a little battery life and don’t have it nag you for a connection.

To disable this go into your System Preferences and click Network. Inside Network click the Airport adapter and untick the “Ask to join new network” option.

Press Apply and you’re done. OS X will now no longer see what network is available and ask you which one to join.

Obviously this won’t affect the performance of your airport card as it will still scan for networks when you invoke the dropdown menu in the Network Preferences or Menubar.