I encountered what I think you are having issues with. When you go to the competition manual link for the 2013 competition, there are two links under "Section 2" that are incorrect. I have attached the urls below each header for your convenience. Hope this helps!
Section 2 - The Arena
Arena Layout and Markings
http://www.usfirst.org/sites/default...d_Markings.pdf
Basic Field Drawings
http://www.usfirst.org/sites/default...d_Drawings.pdf
Game Specific Drawings
http://www.usfirst.org/sites/default...c_Drawings.pdf
Team Drawings
http://www.usfirst.org/sites/default...m_Drawings.pdf
Field Tour Videos
http://www.youtube.com/user/FRCTeamsGlobal
FMS Whitepaper
http://www.usfirst.org/sites/default...Paper_RevA.pdf