Instead of Walkers you can just use the boat GPS or better yet bring your own phone or IPAD with Navionics or something similar on it. The channel is well marked now and we stay a couple degrees West of the first marker (heading from North channel of North sound) before entering the channel. i last used Walkers coordinates about 7 years ago and they were fine. I typically head out of North Sound at 0 degrees True.

https://bvipirate.com/AnegadaApproach.gif

I don't know if there are as many markers as Walker indicates....for some reason i am thinking there were only 4 sets vs 5 but i am sure someone can correct me.