How do I put my "Start" marker in the right place?
If data was being logged prior to the vehicle reaching the starting point, then it may be difficult to define where a race actually started.
Plot an xy graph, showing longitudinal acceleration. You should be able to clearly see the point at which the vehicle made it's initial pull away from the stat line. (Use the zoom feature to find the precise moment). Put the marker over this point.
Now return to the track map, and click on the "Programmatically add a track marker" button.
This will open up a window. Define how long you want the marker to be, according to your own preferences, and the click on the "start of run" marker button.
A marker will now be placed at the exact point specified.