Vertical bars w/numbered increments along right side of Nav chart?
 

What are those used for? (Subject line) I'm running GWX2.0

It's a nomograph. Basically it's lets you find out a 3rd piece of data based on two other pieces of data.

For example, if you know how far a contact travelled in how many minutes, you can draw a line between those two values and where that line intersects the speed graph is it's speed.

Or if you know the speed of a contact you can draw a line between that and how ever many minutes you want to know to be able to plot how far it'll travel given that time and speed.

For a much more detailed instructions of how to use a nomograph, check here:

Advanced Speed Calculation - Using the Nomograph

I never use it. The type is so small on it that I can't even read it... especially at night.

Thanks, Kylania...