Area Setup

Your area is the real-world space the circuit has to fit inside — a table, a garage floor, a hall. You set it in the New Circuit wizard, before you place a single piece, because Auto Fix and every clearance check need it as a starting point rather than an afterthought.

Rectangle or custom boundary

After choosing Scale, the wizard’s Space step offers two ways to define it. Rectangle is a plain rectangle — type its length and width right there in the wizard, in whichever unit system you’re using, then continue to Type. Custom boundary followed by Draw your boundary opens the canvas: click to place each corner, type its exact real-world edge length in the popup that appears, and click back near the start to close the shape once you have at least three corners.

Custom areas also support Enter corner coordinates (keyboard). Once the boundary is complete, choose a circuit type and create your blank circuit. See Getting Started for the complete setup flow.

Auto Fix

Set your area first, and anything you draw is checked against it. In Draw, choose Circuit checks beside the zoom controls at the bottom of the canvas to read boundary, lane-width, and grade warnings. Choose a warning to select its piece. Checks clear means nothing is currently flagged; an empty layout has no checks to show.

When a warning is within its scope, Auto fix appears in the expanded list. It can try to improve the circuit’s fit, piece separation, or tight radii. It does not change lane widths or elevations or fix bridge clearance for you, and it may leave unresolved warnings. It runs only when you choose it. Read Auto fix results afterward and use Undo to reverse the committed change if needed.

Changing the area later

For a box area, click either dimension label on the boundary itself, right there on the canvas, to type a new length or width. Roads and objects stay in place, and clearance warnings update for the new area. See Scale & Units for how the RC scale affects what fits.