Cujo, the attached link explains the sequencing about as well as anything I've heard so far. Thanks for the info. I guess I'm wondering why the numbering sequence etc for the Jepp charts is even an issue. Since we're all basically paperless now, does it really matter or have as much importance as it did years ago when we had to file the charts away in the big brown book??? I never really paid much attention to the chart number etc since I've been pulling them up on my ipad for awhile now.