Just curious, what keeps you from just calling your company flight tech department or training department and ask them. When I come up with something I don't understand in the books, I usually just call them. That way you are assured to get the right answer, and not some guy on the line interpretation.

Just recently transitioned to a WB flying to destinations that had escape routes on the way. Had some serious questions about these, asked the guys I flew with and got many different answers. Finally called the flight tech dep that calculates the routes and got the real answers.

Same with these boards, great to get another perspective, but I would still start with your company.