I see dashed lines in the Heart Rate chart

• What does a dashed line mean?
• When is a dashed line a real trend and when is it a bug?
• Why does this happen?
• How to avoid dashed lines
• Still seeing issues?

What does a dashed line mean?

In the Timeline, your Heart Rate chart may sometimes show a dashed line instead of a solid one. This happens when the watch captures some heart rate data points, but not enough to draw a fully continuous line.

The dashed line is a visual indicator that data collection was partial during that time period.

When is a dashed line a real trend and when is it a bug?

• Dashed line with curves or variations: If the dashed line shows a visible curve or changes in direction, it reflects a real trend in your heart rate. While the data is partial, it can still be considered reasonably representative of what was happening at that moment.

• Perfectly straight dashed line: If the dashed line appears as a completely straight, flat line with no curves, this indicates a known bug. Our team is actively working on a fix.

If you’re unsure which case you’re seeing, sharing a screenshot with Customer Care can help us confirm it for you.

Why does this happen?

Dashed lines usually appear when:

• Sensor contact with the skin was inconsistent

• The watch was worn loosely

• There was movement that disrupted readings

• Data quality was temporarily too low to form a solid line

How to avoid dashed lines

To improve data quality and reduce the chance of dashed lines:

• Wear your NOWATCH snugly but comfortably, ensuring full sensor contact with your skin.

• Avoid wearing it too loosely, especially during movement.

• Make sure the sensors on the back of the watch are lighting up while wearing it. Troubleshoot sensor issues in this article if needed.

• Keep your app and firmware up to date.

Still seeing issues?

If dashed lines persist or you suspect a bug:

• Take a screenshot of the Heart Rate chart where the dashed line is visible

• Contact Customer Care via our web form and share the image so we can assist further

We’re continuously improving data quality and visualization, and your feedback helps us do that.