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

  • Monday
    01/18/2021
  • 3:27 PM - Slack Flood
  • 9:18 PM - Slack Ebb

  • Tuesday
    01/19/2021
  • 2:38 AM - Slack Flood
  • 9:56 AM - Slack Ebb
  • 4:16 PM - Slack Flood
  • 10:32 PM - Slack Ebb

  • Wednesday
    01/20/2021
  • 3:19 AM - Slack Flood
  • 10:28 AM - Slack Ebb
  • 5:05 PM - Slack Flood

  • Thursday
    01/21/2021
  • 12:01 AM - Slack Ebb
  • 4:04 AM - Slack Flood
  • 11:07 AM - Slack Ebb
  • 5:56 PM - Slack Flood

  • Friday
    01/22/2021
  • 1:38 AM - Slack Ebb
  • 5:03 AM - Slack Flood

The Narrows


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