I wanted to order the service manual for my 2003 Accord EX V-6 with
Navigation.  I went to the Helm site, and the order descriptions were
very confusing.  I even called them, and am more confused.

It seems there are multiple service manuals and multiple service
manual supplements.  The difference being that there is for example a
service manual for the 2003, another for the 2003 & 2004, another for
the 2003, 2004 & 2005 and one for the 2003, 2004, 2005 & 2006.  In
some cases these multi-year manuals are less expensive than a single
year manual.

My question is why would a person not want to buy the latest
multi-year manual instead of the single year manual?  Right now I am
only interested in the model year 2003, but I might have one of the
others some day.  Do these multi-year manuals have less and/or
abbreviated information for each year?  The order person at Helm
couldn't answer that question.