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Viewing the Surface Interval Glance

  1. From the watch face, press UP or DOWN to view the surface interval glance.
  2. Press START to view your current oxygen toxicity units (OTU) and central nervous system (CNS) percentage.
    NOTE: The OTU accumulated during a dive expire after 24 hours. For more information about the National Oceanic and Atmospheric Administration (NOAA®) OTU guidelines and calculations, see garmin.com/dive/cns-otu.

    Surface interval screen with callouts

    1

    Green Green: Under the NOAA recreational limit.

    Yellow Yellow: NOAA recreational limit.

    Red Red: NOAA military limit.

    2

    Green Green: 0 to 79% CNS oxygen toxicity.

    Yellow Yellow: 80 to 99% CNS oxygen toxicity.

    Red Red: 100% or greater CNS oxygen toxicity.

  3. Press DOWN to view your tissue load details.
  4. Press DOWN to view your no-fly time remaining and the time of day the no-fly period ends.
GUID-9183E86B-2399-4CFC-AB50-EAFC6D6ED326 v8
August 2026
© 2023 Garmin Ltd.