Stumbled across a PDF from Canon on the Internet, not seen it before. It appears to be a nicer guide to the 5D MK III AF settings than the paper manual that came with the camera.
Link
http://cpn.canon-europe.com/files/p...ii/AF_guide_EOS5D_MarkIII_eng_January2013.pdf
Link
http://cpn.canon-europe.com/files/p...ii/AF_guide_EOS5D_MarkIII_eng_January2013.pdf