In a previous article, Roy Smith said:
[Howie Keefe Airchart Systems]
If I understand it correctly, you get a new SIAP book once a year, and
every 2 weeks get a cumulative list of updates to that book. What
happens if halfway through the year, your book is so beat up that you
need to buy a new one? The updates sheet you're getting is now relative
to an issue of the book other than the one you're using. How does that
work out?

Well, if the update says "change the MDA to 2450" and the MDA is already
2450, then you don't need to do the update, do you?


--
Paul Tomblin http://xcski.com/blogs/pt/
"The thing you don't check is the thing that will kill you."
-- Rick Grant (quoting RCAF pilot training)