No that is the old old book with the even older stadi fix line
The stati had an issue where all masts were set at 20m
so that line is 20m to offset the error.
TDW fixed the mast issue with his UI but that old book could not be looked at without targeting a ship - so scope had to be up.
This is when he made the soan - to replace the book. The soan does everything the id book does and much much more.
To get your xo box back - look at the buttons top right. There is one for xo on/off