Hi there, unfortunately I do not have that answer as I am in the same boat as you. But wanted to let you know that I plan on reaching out to PSI to find out more information. From my understanding, they provide a small tab bar at the top that has some "tools", one being a calculator. My biggest question/ concern, are for the grading related questions that involve multiple math equations, while looking at a grading plan, in order to solve for elevation "X".
I'm hoping there is some type of notepad "tool", along with the calculator, because it would otherwise create a disadvantage vs having the typical white board & marker to jot numbers down on.
I will follow up once I hear more.