NAUI Instructor Exam Study Guide
2026/2027 — Verified Practice Questions
& Correct Answers | Latest Updated
Version
Henry's Law - correct answer-The amount of gas dissolved in a liquid is directly
related to its partial pressure above the liquid.
Relationship of gas solubility and temperature - correct answer-Solubility of gas
decreases with increasing temperature
(INVERSELY RELATED)
Inert gas loading in relation to body tissue - correct answer-Body tissue absorbs
more inert gas as depth increases
Benefit of Dive Computer compared to Dive Tables - correct answer-Gives the
diver credit for shallow portions of the dive
Cold or Strenuous dive planning rule - correct answer-Use the next greater dive
TIME to determine letter group
,Equilibrium as it relates to nitrogen in the body - correct answer-When the
pressure of nitrogen is balanced between air and your body
Haldane surfacing ratio - correct answer-Originally 2:1 - Updated with new
research to 1.58:1
Tissue compartment half-time - correct answer-The time required for the
compartment to absorb or eliminate half of the pressure difference between
what it started with and the ambient pressure
M-Value of tissue - correct answer-The maximum allowable nitrogen (inert gas)
pressure in a specific tissue
NAUI recommendation for diving while pregnant - correct answer-Do not dive
while pregnant
Haldane tissue compartments - correct answer-Haldane - 5 compartments
Modern Computers - Apx. 16 compartments
Tissue compartment - correct answer-Mathematical model consisting of multiple
theoretical tissues and their relative halftimes
Fast compartments - short halftimes
Slow compartments - long halftimes
Ascent rate at altitude - correct answer-Slower than at sea level
, Extend dive times with gas by - correct answer-Decreased nitrogen and increased
oxygen in breathing gas
RNT - correct answer-Residual Nitrogen Time
Tme already spent at the repetitive dive depth (dive tables)
Procedure for missed decompression stops - correct answer-Remain out of the
water, rest, breathe 100% oxygen, drink fluids, be monitored for signs of
decompression illness, transported to a hyperbaric facility if symptoms arise
SIT - correct answer-Surface Interval Time
Longer time at the surface allows for increased repeat dive times
Canadian Dive Tables published by the Defense and Civil Institute of
Environmental Medicine (DCIEM) - correct answer-Based on 20+ years of
research pioneered by Kidd and Stubbs (1962)
Swiss Dive Tables - correct answer-Developed by A.A. Bühlmann at the University
of Zurich - EXTENDED TO INCLUDE ALTITUDE DIVING
If the time spent making a "precautionary stop" at 5 msw (15 fsw) causes your
Total Dive Time to exceed the Dive Time Limits, you should: - correct answer-Use
the Maximum Dive Time as your Total Dive Time
Aching pains an hour after a dive might be: - correct answer-Decompression
sickness
2026/2027 — Verified Practice Questions
& Correct Answers | Latest Updated
Version
Henry's Law - correct answer-The amount of gas dissolved in a liquid is directly
related to its partial pressure above the liquid.
Relationship of gas solubility and temperature - correct answer-Solubility of gas
decreases with increasing temperature
(INVERSELY RELATED)
Inert gas loading in relation to body tissue - correct answer-Body tissue absorbs
more inert gas as depth increases
Benefit of Dive Computer compared to Dive Tables - correct answer-Gives the
diver credit for shallow portions of the dive
Cold or Strenuous dive planning rule - correct answer-Use the next greater dive
TIME to determine letter group
,Equilibrium as it relates to nitrogen in the body - correct answer-When the
pressure of nitrogen is balanced between air and your body
Haldane surfacing ratio - correct answer-Originally 2:1 - Updated with new
research to 1.58:1
Tissue compartment half-time - correct answer-The time required for the
compartment to absorb or eliminate half of the pressure difference between
what it started with and the ambient pressure
M-Value of tissue - correct answer-The maximum allowable nitrogen (inert gas)
pressure in a specific tissue
NAUI recommendation for diving while pregnant - correct answer-Do not dive
while pregnant
Haldane tissue compartments - correct answer-Haldane - 5 compartments
Modern Computers - Apx. 16 compartments
Tissue compartment - correct answer-Mathematical model consisting of multiple
theoretical tissues and their relative halftimes
Fast compartments - short halftimes
Slow compartments - long halftimes
Ascent rate at altitude - correct answer-Slower than at sea level
, Extend dive times with gas by - correct answer-Decreased nitrogen and increased
oxygen in breathing gas
RNT - correct answer-Residual Nitrogen Time
Tme already spent at the repetitive dive depth (dive tables)
Procedure for missed decompression stops - correct answer-Remain out of the
water, rest, breathe 100% oxygen, drink fluids, be monitored for signs of
decompression illness, transported to a hyperbaric facility if symptoms arise
SIT - correct answer-Surface Interval Time
Longer time at the surface allows for increased repeat dive times
Canadian Dive Tables published by the Defense and Civil Institute of
Environmental Medicine (DCIEM) - correct answer-Based on 20+ years of
research pioneered by Kidd and Stubbs (1962)
Swiss Dive Tables - correct answer-Developed by A.A. Bühlmann at the University
of Zurich - EXTENDED TO INCLUDE ALTITUDE DIVING
If the time spent making a "precautionary stop" at 5 msw (15 fsw) causes your
Total Dive Time to exceed the Dive Time Limits, you should: - correct answer-Use
the Maximum Dive Time as your Total Dive Time
Aching pains an hour after a dive might be: - correct answer-Decompression
sickness
