It would be very helpful if there was a navigation pane/table of contents that is automatically populated with the titles of the steps and can be used to jump to a specific step. Example: I currently have a 27-step procedure, each step of which is at least 1 and in some cases up to 5 letter pages of text/images. It can take a long time to scroll to the part I want.
Bonus points if it also has a checkbox that you can toggle the step as not/completed without having to scroll up/down to the step.
It might also be helpful if there were shortcuts at the bottom of a step to mark it as complete & move to the next step.