I frequently review courses done by final signatories to see how they do things and find map mistakes. My certifiers catch a lot of mine so I think ironically, my work is more likely to be right though sometimes we both miss things I did.
Also, this puts an e-mail copy of my numbers in cyber space. This may be heresy but I am convinced our product would be improved if we had perhaps, and I realize it sounds like I am talking my own book here, a second experienced measurer review final signatory courses before publication. That would also put the numbers out on a server.
Lynwood Wagner
IAAF B