Calculating SAC and RMV

  • Surface Air Consumption (SAC): The amount of gas you breathe in one minute at the surface in terms of pressure (psi). SAC can be expressed as pressure (psi) or volume (cu ft).
  • Respiratory Minute Volume (RMV): The amount of gas you breathe in one minute at the surface in terms of volume (cu ft).
  • Resting SAC: The rate at which you breathe when relaxed.
  • Working SAC: The rate at which you breathe when stressed.

Gas Used (psi):


Duration (min):


Average Depth (ft):


Cylinder Size (cu ft):


Working Pressure (psi):





Admiralty Inlet

  • Saturday
    10/24/2020
  • 2:09 PM - Slack Ebb
  • 7:18 PM - Slack Flood

  • Sunday
    10/25/2020
  • 12:38 AM - Slack Ebb
  • 6:38 AM - Slack Flood
  • 2:56 PM - Slack Ebb
  • 8:19 PM - Slack Flood

  • Monday
    10/26/2020
  • 2:04 AM - Slack Ebb
  • 7:42 AM - Slack Flood
  • 3:35 PM - Slack Ebb
  • 9:09 PM - Slack Flood

  • Tuesday
    10/27/2020
  • 3:20 AM - Slack Ebb
  • 8:40 AM - Slack Flood
  • 4:08 PM - Slack Ebb
  • 9:51 PM - Slack Flood

  • Wednesday
    10/28/2020
  • 4:22 AM - Slack Ebb
  • 9:32 AM - Slack Flood

The Narrows


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