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Altitude Conversion Table For Diving

Altitude Conversion Table For Diving (IN FEET)

ACTUAL DEPTH	1000	2000	3000	4000	5000	6000	7000	8000	9000	10000
10	10	15	15	15	15	15	15	15	15	15
15	15	20	20	20	20	20	25	25	25	25
20	20	25	25	25	25	25	30	30	30	30
25	25	30	30	30	35	35	35	35	35	40
30	30	35	35	35	40	40	50	50	50	50
35	35	40	40	50	50	50	50	50	50	60
40	40	50	50	50	50	50	60	60	60	60
45	45	50	60	60	60	60	70	70	70	70
50	50	60	60	60	70	70	70	70	70	80
55	55	60	70	70	70	70	80	80	80	80
60	60	70	70	70	80	80	90	90	90	90
65	65	70	80	80	80	90	90	90	100	100
70	70	80	80	90	90	90	100	100	100	110
75	75	90	90	90	100	100	110	110	110	110
80	80	90	90	100	100	100	110	110	120	120
85	85	100	100	100	110	110	120	120	120	130
90	90	100	110	110	110	120	130	130	130	140
95	95	110	110	110	120	120	130	130	140	140
100	100	110	120	120	130	130	140	140	140	150
105	105	120	120	130	130	140	150	150	150	160
110	110	120	130	130	140	140	150	150	160	160
115	115	130	130	140	140	150	160	160	170	170
120	120	130	140	140	150	150	170	170	170	180
125	125	140	140	150	160	160	170	170	180	180
130	130	140	150	160	160	170	180	180	190	190

(Table Credit: Permission granted by Best Publishing Company NOAA Diving Manual Fourth Edition Flagstaff, Arizona.)

Ascents at altitude should be 30 feet per minute.

An altitude table is used with dive tables when diving 1000 feet or more above sea level. Atmospheric pressure drops as we climb in altitude. At sea level atmospheric pressure is 14.7 pounds per square inch. Salt Lake City, at 4350 feet, is 12.6 pounds per square inch. The same nitrogen bubble in your body at sea level will be larger at a higher altitude.

EXAMPLE 1:
Let's say you dive at Bear Lake. Your dive is 25 minutes at 30 feet. Bear Lake is 5900 feet high. Round up to 6000 feet. Look at the table across from actual depth of 30 feet to the 6000 column, finding 37 feet. Round up to 40, figure your dive with your dive tables for 25 minutes at 40 feet.

EXAMPLE 2:
Let's go to Fishlake next. Fishlake is 9000 feet high. Dives here need to be adjusted by looking in the 9000 feet column. This means if we dive at an actual depth of 60 feet, our altitude adjusted depth would be 84 feet. We would round up to 90 feet to figure our dive. (Note: If your dive tables are in increments of five feet, round up to 85 feet.)

PLAN YOUR DIVES!

***CAUTION: FOR USE BY CERTIFIED DIVERS ONLY.***

Atmospheric Pressure Formula

Here is a simple formula to figure the atmospheric pressure at any altitude. This formula isn't exactly on, but pretty close. You will find that it is just a few hundredths of a pound off. The elevation is in feet and the atmospheric pressure will be in pounds per square inch.

Elevation - 361 = A
55,906 - A = B
55,906 + A = C
B/C = D
D * 14.55 = Atmospheric pressure

Another way to look at the formula is:
(56,267 - elevation)/(55,545 + elevation) * 14.55 = Atmospheric pressure



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