Sometimes an obvious question goes unnoticed. And I do not actually know anyone who has read their manual from cover to cover...and I do not really want to know this person if they exist....
If one looks at the way the manuals for many of the Nikon DSLR's are laid out....it is almost overwhelming...450 pages is a lot. And to search for the information we need, well, sometimes the Index does not do what we want.
I have found a real help is to download the manual and have it on our computers. And, there is an App so one can have it on our iPhones or possibly other smartphones. The advantage is one can search the manual, and then go through only the pertinent information, hopefully finding the answer to our question.
In the USA, downloads are available from Nikon at http://www.nikonusa.com/en/Service-And-Support/Download-Center.page