ZBrushCentral

Snapping Cursor?

Hello everyone, I’m rather new to Zbrush and I’m working on a model with which I need to do some precision detailing. I need to add these details at very specific distances from each other, and I was wondering if there was a way to do this in Zbrush? In the CryEngine 3, there is a way to snap the cursor to the terrain at specific intervals as per a grid, but I cannot seem to find such a similar function in Zbrush?

Sorry about the bump, surely this must be something simple that I am overlooking?

http://www.zbrushcentral.com/showthread.php?9095-NEWBIE-LESSON-ONE-The-Interface

At what part should I be taking a look at? I know many of the basics already, just stuck on this one.