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Troubleshooting

Resetting the Device

If the device stops responding, you may need to reset it. This does not erase any of your data or settings.

Hold PWR for 20 seconds.

The chronograph is not detecting my shot velocity

You can perform these actions to help determine why the chronograph isn't detecting your velocity.

  • Verify the chronograph is facing the target.
    With the screen facing you, the large, flat side of the chronograph should point at the target.
  • Verify the target is at least 20 meters or 20 yards from the chronograph.
  • Verify the chronograph and the weapon are properly aligned based on your weapon type (Recording Shot Data).
  • Verify the session is active.
    The shot data screen appears while the session is active.
  • Verify that you selected the correct velocity range for your weapon and projectile while setting up your session.
  • Verify that you are not exceeding the maximum recorded shots per second (Specifications).

The chronograph is detecting shots from the shooter next to me

It is possible for the chronograph to detect shots from adjacent shooters. For best results, you should always ensure the nearest shooter is at least 1.5 m (5 ft.) from your location.

The recorded velocity is higher when the chronograph is mounted to a rifle

When the chronograph is mounted to a rifle, the recorded velocity can appear higher than if the chronograph were separate from the rifle. The rifle's backward movement during recoil offsets the recorded numbers by a small amount. In most cases, the velocity difference is not noticeable. Rifles with a heavy recoil can offset the measurements by up to 3 m/s (10 ft./sec.).

The chronograph temperature is approaching a critical level

To prevent overheating, the Xero® C2 chronograph turns off when it is used at temperatures above the listed operating temperature (Specifications). If a warning message appears, you should move the device to a cooler location.

The chronograph does not turn on

  • Make sure the chronograph is within the approved operating or charging temperature range (Specifications).
  • Fully charge the chronograph.
    NOTE: A full charge can take up to 5 hours (Charging the Device).

If the chronograph does not turn on, disconnect the charger and wait 15 seconds. Reconnect the charger and fully charge the chronograph.

My language is missing from the chronograph

If the language files are missing from your Xero C2 chronograph, you can reinstall them using the Garmin Express™ application.

  1. Download and install the Garmin Express application on your computer (Installing Garmin Express).
  2. Connect the Xero C2 chronograph to your computer using a USB-C® cable.
  3. From the Garmin Express application, select your Xero C2 device.
  4. Select Tools & Content.
  5. Select the Utilities tab.
  6. Select Language Files.
  7. Select one or more languages, and select Install Now.
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January 2026
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