Start split location and the impact on timing accuracy

One of the biggest benefits of Protern is that you can review athlete data in different ways. With the same GPS dataset, you can build one, two, or multiple quantriqs that focus on different sections of a run.

This flexibility becomes important when examining how time was gained or lost across a course. Small changes in split placement can significantly affect the accuracy of timing data.

In cases where the start split is placed too close to the actual start gate, it takes only seconds to edit the quantriq and reposition the split. This can be done on a phone, tablet, or computer through the browser-based workflow described in How Protern Works.

Same GPS dataset, different quantriq

The location of the first split has a measurable impact on timing accuracy in alpine ski racing. If the split is placed too close to the start gate, the sensor does not yet have sufficient movement to stabilize its internal correction.

Placing the first split approximately 2.5 meters, or 8 feet, from the actual start gives the system enough distance to confirm that the skier is moving cleanly before the time begins.

When combined with video and GPS data linked together, this adjustment makes it easier to interpret acceleration patterns and section times without distortion at the start.

The example below uses data from over 100 runs on a 300 meter straight course with no turns.

Data looks inconsistent? Review your split placement

One of the most common causes of unusual time data is a start position that is too close to the gate. The result can be inconsistent section times that do not match what the coach sees in the video.

Before assuming an athlete execution issue, review the quantriq and confirm the split placement. A small adjustment lower on the course often produces more stable and accurate timing data for the remainder of the run.

When paired with side-by-side run comparison, accurate start placement ensures that differences in time reflect real performance differences rather than measurement artifacts.

Accurate split positioning supports clearer analysis throughout the rest of the run. When timing is stable from the start, coaches can focus on line choice, acceleration build, and execution without questioning the measurement itself.

For a broader overview of how Protern links timing, video, and athlete data during training and racing, see GPS ski video analysis for alpine racing.