Setting the GPS 496 to use knots

I have searched through the menus and through the manual, and I finally give up. How the heck do I change the GPS 496 to read in knots, and nautical miles?! The manual says that you can, yet I can’t find where it says HOW to do so.

Go to Main Menu > Setup Tab > Units Sub Tab.
In setup tab you must go right util Units Sub Tab appears.
From the manual:
"Units Sub Tab
The Units sub tab allows you to customize measurement units for
the entire system. To open the Units sub tab, press Menu twice to
open the Main Menu. Select Setup from the vertical tab list. Then
select Units from the row of tabs along the top of the page."

Thank you!