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Altitude Correction
Warning: I can not be held responsible for anybody who get's themselves hurt as a result of mis-using this calculator. I do not guarantee the accuracy of the information provided on this page.
The basic theory to altitude correction is that there will be 4% less atmospheric pressure in the atmosphere for every 1000 feet above sea-level. Dive tables assume that you will be at sea-level when you start the dive and return to sea-level when you end the dive. This means the tables are assuming that you will start the dive at 1ATA (atmosphere) and end the dive at 1ATA. So let's say that you start a dive at 5000 feet above sea-level, or .8ATA and you end the dive at .8ATA. The tables are assuming that you will end the dive at 1ATA. At 5000 feet above sea-level you will reach 1ATA of pressure at around 6 ft of water. The tables do not account for the pressure being relieved on the body from 1ATA to .8ATA, or 6ft to the surface.
Altitude correcting your depth attempts to compensate for this by finding the depth difference based on your altitude and planning your dive based on that depth difference. There are some people who will say that altitude correcting isn't needed since you start the dive at a lesser pressure or even that your body will compensate for the altitude with time. However, either way you look at it, altitude correcting adds a safety factor to your diving.
This application is for scuba divers that dive in any waters above sea level.
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Altitude = feet Altitude rounded to the up to the nearest 1000 feet = 0 feet Every 1000 feet in altitude is equal to 4%. The percent at 0 feet altitude is equal to 0%. Maximum depth = feet Altitude Corrected Depth = 0 feet Depth x (1 + Altitude_Percent) = Altitude_Corrected_Depth x 1% = 0 feet |
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