Very very useful. Don't know Y ATNS do not have a similar copy on thier website. (maybe they do, but I too doff to find it.) If you fly in the sectors often it not a big deal, but I find they get quiet P!ssed off if your report at sector boundry and you not there. Govt publishers will not print the sector boundries so you have to draw them in by hand and can make mistakes. (Something about sectors not being ICAO?)
PS
If you are a ML pilot who does not stray into controlled air space it good info to have in any case if something goes wrong. They will dispatch SAR if you call them on the freq's (say while on trip in berg

). Also most of the big birds are on these sector freq's and will relay if you in SH!T.
Thanks Bennie.