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Page Title: Determining the probability of trapping
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DETERMINING THE PROBABILITY OF TRAPPING

At sea, in certain parts of the world, trapping occurs with almost predictable regularity. When trapping occurs, certain combinations of at-mospheric conditions are nearly always present:

Temperature increases with height

Moisture decreases with height

Occasionally, deviations from these two basic conditions do occur. The temperature can decrease with height as long as there is a sharp decrease in moisture with height.  

Understanding the relationship between refractivity and the changes in moisture and temperature will enable you to make reasonable estimates on the occurrence of trapping.

There are two manual methods of determining whether trapping conditions exist at your ship. The first method is simply an estimate, while the second method (the ductogram) is much more accurate.

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