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

  • Wednesday
    04/01/2020
  • 11:28 AM - Slack Ebb
  • 5:54 PM - Slack Flood

  • Thursday
    04/02/2020
  • 2:38 AM - Slack Ebb
  • 7:00 AM - Slack Flood
  • 12:36 PM - Slack Ebb
  • 6:59 PM - Slack Flood

  • Friday
    04/03/2020
  • 3:25 AM - Slack Ebb
  • 8:11 AM - Slack Flood
  • 1:46 PM - Slack Ebb
  • 8:01 PM - Slack Flood

  • Saturday
    04/04/2020
  • 4:01 AM - Slack Ebb
  • 9:09 AM - Slack Flood
  • 2:55 PM - Slack Ebb
  • 8:59 PM - Slack Flood

  • Sunday
    04/05/2020
  • 4:32 AM - Slack Ebb

The Narrows


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