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
    01/27/2020
  • 8:00 AM - Slack Ebb
  • 1:10 PM - Slack Flood
  • 6:32 PM - Slack Ebb

  • Tuesday
    01/28/2020
  • 12:42 AM - Slack Flood
  • 8:21 AM - Slack Ebb
  • 1:50 PM - Slack Flood
  • 7:21 PM - Slack Ebb

  • Wednesday
    01/29/2020
  • 1:17 AM - Slack Flood
  • 8:41 AM - Slack Ebb
  • 2:30 PM - Slack Flood
  • 8:12 PM - Slack Ebb

  • Thursday
    01/30/2020
  • 1:52 AM - Slack Flood
  • 9:06 AM - Slack Ebb
  • 3:12 PM - Slack Flood
  • 9:07 PM - Slack Ebb

The Narrows

  • Monday
    01/27/2020
  • 1:35 AM - Slack Flood
  • 2:10 AM - Slack Ebb

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