@klindy When mapping ZO from the Entrance gates and traveling towards the exit gates, as you approach, ZO beeps saying that you should be there, but you press the actual exit gate position, therefore mapping the actual course. If it is out of the tolerance length, the course won't map sucessully. Once this is done, ZO has a start point from each end. But it also has the exit gates in mind (not necessarily 259m) each time.
As evidence of this, do a test, drive through the start gates at a slight angle, drive a big arc around 3 ball, and then drive back through the exit gates.
You will notice several things.
The boat will be on a different path, but it will still maintain the set speed. (speed priority, not timing or distance)
It will start and finish timing at either gates. (not 259m)
You have traveled further, but maintained speed, so the time you get at the exit gates will be slower. perhaps even out of tolerance.
To me this proves that ZO is a lot more to it than just giving good times.