Use the Graph area in Circuit Tools for macOS to compare channel data from selected laps. You can select up to 6 channels. The Speed and Delta T channels will be selected by default when you open a file.
Image of the Chart area in Circuit Tools for macOS
The fastest lap will automatically be selected and traced when you load a file. You can choose a second lap in the Laps area to use for a comparison. If you have loaded multiple files, the fastest lap from each file will automatically be selected and displayed for comparison.
The lap trace will be green. If you add a second lap for comparison, the fastest lap trace will be green, and the second lap trace will be red.
Drag the cursor left or right, or tap/click on the graph to move through the file. The legend on the right-hand side of the screen will update the channel values accordingly.
Moving the cursor in the Graph area will also move the cursor in the Laps area. If you are displaying a Video, the video will also skip to the location of the cursor.
The coloured bar above the graph indicates the position of each split in the graph data. Click on a split to zoom the chart to that split.
You can zoom to a specific part of the graph by left-clicking and dragging over the target area on the split bar.
| Click theExpandbutton to toggle the graph view between full-screen mode and the default view. | |
| You can hide thumbnails by using theShow/HideThumbnailsbutton, or by using theCommand + Tshortcut. | |
| Show available channels that can be compared. | |
| Zoom | Magic Mouse:Single finger swipe up/downStandard mouse:Use the Scroll Wheel.Left-click, drag to the right and let go of the mouse button to zoom in.Left-click and drag to the left to zoom out all the way.Keyboard:Up and down arrow keys.Touch Screen:Pinch to zoom |
| Pan | Keyboard:Use the left and right arrow keys for large increments.Use Alt + arrow keys for smaller increments.Hold the command key and use left-click to pan.Magic Mouse:Single finger swipe left/ right.Trackpad:Swipe with two fingers left/ right.Standard mouse:Right-click and hold, then drag left or right. |
Delta-T (Lap-time Difference)
A useful parameter for comparing laps is the Delta-T channel. Delta-T is the running lap time difference between two laps. It gives a clear indication of where time is lost or gained around the circuit.
When Delta-T is increasing, you are losing time. When Delta-T is decreasing, you are gaining time.
The first step is to identify the biggest changes in Delta-T and concentrate on these areas.
Sometimes, in a corner, there may be a large gain followed by a large loss. This often happens when you enter a corner faster, but exit it more slowly.
It is often surprising how much time you lose down the straight by exiting a corner a little bit slower than previously.
There are two ways of aligning comparison data: Time and Position.
Position is the default X-axis, and this is the method we recommend for comparing two different laps. You can use Time in special circumstances.
You can change the alignment by clicking on the Settings button at the top right of the screen.
| Speed (km/h) | GPS Speed over ground |
| Delta-T (s) | Lap time difference between two laps |
| Lat acc (g) | Lateral acceleration (cornering g-force) |
| Long acc (g) | Longitudinal acceleration (accel/braking g-force) |
| Combined g | Combined lateral and longitudinal acceleration |
| UTC time (s) | Co-ordinated Universal Time |
| Distance (m) | Rolling distance travelled since start of lap |
| Satellites | Number of satellites being tracked |
| Latitude | Latitude position in degrees and minutes |
| Longitude | Longitude position in degrees and minutes |
| Heading (°) | Vehicle heading in degrees |
| Height (m) | Height |
| Vertical velocity (m/s) | Vertical velocity |
You can view additional channels, such as CAN-acquired channels, by scrolling down in the pop-up menu.
Thumbnails are shown above the graph and makes it easier to identify interesting parts of a lap quickly. Each thumbnail image shows a still from the video at the part of the graph that is level with the left side of the thumbnail. There is also a Current Position indicator that states how far through the lap you are.
You can use the Settings button at the top right of the screen to change whether individual laps are displayed or the whole session.
