How do I check my depth on OS X?

I know that if you want to check your depth on a PC, you press F3, but on my Mac, pressing F3 brings up Mission Control and/or the Dashboard.

Is there a way to check depth in OS X without manually counting blocks?

Solution 1:

The debug screen is triggered when the F3 key is pressed (Fn+F3 on Macs and some laptops).

—Debug screen, Minecraft Wiki

Solution 2:

If you prefer to not always have to press fn when you press F3 then you can reverse the setting so that you press fn with a function key to perform the standard OS X task (i.e. Mission Control would be fn+F3).

System Preferences > Keyboard > Use all F1, F2, etc. keys as standard function keys.

Solution 3:

You need press the fn key and F3 simultaneously

If you press shift Fn and F3 it won't show the graph and pie chart.