Ambient Pressure On The Surface
Sometimes changes in ambient pressure, while diver is on the surface, are drawn on a dive profile. The changes may be caused by flying, land travel involving changes in altitude, or atmospheric pressure changes due to weather. Ambient pressure changes before and after diving can be significant in decompression planning. Starting dives at altitude also has an impact on dive and decompression planning.
Read more about this topic: Dive Profile
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—Plato (c. 427–347 B.C.)
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—Marcel Proust (1871–1922)