Originally Posted by
Weston@HPTuners
That can get a little tricky when you are staging (or moving up in line) close to the start line, as it may be mistaking your movement for the start of your run, and then gets confused when you slow back down and/or due to normal GPS fluctuations.
But there are a few things you can do to improve your success in this situation:
1) Ensure that a start point is set precisely. I like to have the track setting screen open for a bit (so it has plenty of time to acquire a good GPS fix), then stand right in between the timing lights for a moment and press the "Set Point Here" button.
2) When it takes you to the map view screen, be sure to set the start line's Tolerance to "Narrow". This will reduce the area that could potentially trigger the start of timing.
3) When you are moving up to the start, try to keep it under 5 MPH. That will further help eliminate a false start.
We've been getting pretty good results using tips #1 and #2 for the autocross portion of Optima USC events. We don't have the ability to control the drivers, so tip #3 goes out the window, but it seems to have been working pretty well regardless. Their timing lights are typically spaced a small distance from the actual start cones, very much like how I've seen SCCA do it, so we set the start and finish points between the actual lights.