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Graph analysis with several laps overlaid and the chase-cam map

This is where you find the time. Plot any channel your logger recorded, across any laps you want to compare, over a satellite map that follows your cursor around the track.

Plotting channels

The Channels list on the left holds everything the session logged, plus channels AimMac derives from GPS. Check one and it opens in its own pane, stacked under the others and sharing one x-axis. The search field under the header narrows the list as you type — by name or by unit, in any word order, so "temp water" finds Water Temp and "bar" finds every pressure. ⌘F jumps to it from anywhere in the window.

Channels AimMac works out rather than reads are grouped at the bottom of the list under Calculated:

• GPS Lateral G and GPS Longitudinal G, worked out from the GPS trace rather than an accelerometer — so cornering and braking traces are there even for a session recorded by a phone, a VBOX, or a bare GPS logger.
• Steering Angle (sim), Throttle (sim) and Brake (sim) — estimated from those same accelerations. Most sessions record nothing about what the driver's hands and feet were doing; these say what the car's motion implies they were doing. They're estimates, and named that way: read them for shape — where the driver got back on the power, how quickly the brake came off, whether the hands were smooth — rather than as a replacement for a real sensor.

A session that logs the real thing keeps those channels too, so the two can be compared side by side. Hover any derived channel's row and it says what it was worked out from — including why the simulated throttle draws a decaying curve on a flat-out pull: acceleration falls away as speed rises, so it reads closer to a torque trace than to a pedal trace.

Each channel row has:

• a color swatch — click it to pick that channel's trace color;
• a unit override menu, if the channel can be converted.

The Imperial / Metric switch in the Channels header flips every convertible channel at once. Your global default lives in Settings, but changing it here only affects this graph.

Time or distance

The Time | Distance control above the graph decides what the x-axis measures.

On a time axis, two laps compared from their own starts drift apart as they diverge — by the end of a lap that's a few seconds quicker, you're comparing one corner against another. On a distance axis both laps are at the same place on track at the same point in the graph, so braking points, apexes and where the power went down line up, and the car markers on the map sit at the same corner rather than at the same instant. That's what it's for.

Two things follow from what a distance axis is, and are worth knowing rather than being surprised by:

• Standing still takes no space. A pit stop is a single point on a distance axis, because the car covered no ground.
• Different lines are different lengths. A wider line really is longer, so compared laps don't all end at the same place — the axis stops at the shortest one.