| AT |
Atmospheres, 14.7 PSI |
| ATA |
Atmospheres Absolute: AT + 1 |
| BT |
Bottom Time: |
| CNS |
Central Nervous
System toxicity limitations |
| D |
Depth in FSW,
FFW, MFW, MSW, or PSI |
| Dive Buddy |
A true buddy,
not same day same ocean, a person that starts dive with you and finishes
the dive with you including decompression time. You training and
practice and/or use the same procedures. |
| Diving, Boat |
Any dive
conducted from a boat (private or commercial) |
| Diving, Cave |
A dive where
natural light is NOT visible to the diver at all times (this include
wrecks or cavern structures). Special training is required! |
| Diving, Cavern |
A dive where
natural light is visible to the diver at all times (this include wrecks
or cavern structures). Special training is required! |
| Diving, Recreational |
Any dive to depths less than
130 FSW and NO planned decompression. |
| Diving, Shore |
Any dive
conducted from the shore, not utilizing a boat. |
| Diving, Technical |
Planned decompression dive
to any depth with any gas mixture that will support human life (well
including cock roaches). Special training is required. |
| EAD |
Equivalent Air Depth: |
| EANx |
Equivalent Air Nitrox plus Oxygen
percentage |
| END |
Equivalent Narcotic Depth
or Equivalent Nitrogen Depth |
| Fg |
Fractional of
Gas, 1 = FG1 + FG2 + FG3 ... |
| FHE |
Fractional HE |
| FN2 |
Fractional N2 |
| FO2 |
Fractional O2 |
| Gauges, Digital |
Use for Gas Mixing: Range 0 - 4000 or 0 - 5000, increment
1, error Spec 1/4% of range, i.e. 0 - 5000 psig is +- 12.5 psig |
| Gauges, SPG |
|
| Gradient Factor (GF): |
- GF:
- GFL (Low):
- GFH (High): |
| Helium Mixes: |
Helium mixes are any gas
mixture with some helium content. The helium is used to reduce the
narcotic affect of the nitrogen in the mix.
- HeliAir: A mixture of Helium and air as the top off gas (no
additional oxygen is added). Resulting mix has a FO2 of less than .21
(21%).
- HeliOx: Any gas mixture of Oxygen and Helium only.
- NormOx: A gas mixture with a FO2 of approximately .21 (21%)
Oxygen.
- Trimix: A typical gas mixture of O2/HE/N2 were Oxygen, Helium,
and Nitrogen are blended together to achieve the desired mixture or
percentage. The O2 content is greater than that which could achieved
using a HeliAir mixing technique. The resulting mix has a FO2 of less
than .21 (21%)
- TriOx: A typical gas mixture of O2/HE/N2 were Oxygen, Helium,
and Nitrogen are blended together to achieve the desired mixture or
percentage. The resulting mix has a FO2 of greater than .21 (21%). This
mixture is generally used within the recreational depth limits to reduce
the narcotic affects of Nitrogen and the benefits of Helium in any mix. |
| NOAA I |
EAN 32 |
| NOAA II |
EAN 36 |
| MOD |
Maximum Operating Depth |
| S-Drill |
Safety Drill |
| Standard Back Gas
Mixes |
< 100 FSW Trimix
30/30, As per GUE and WPKK
< 150 FSW Trimix 21/35, As per GUE and WPKK
< 200 FSW Trimix 18/45, As per GUE and WPKK
< 250 FSW Trimix 15/55, As per GUE and WPKK
< 300 FSW Trimix 12/70, As per GUE and WPKK
< 400 FSW Trimix 10/70, As per GUE and WPKK |
| Standard Deco Gas
Mixes |
MOD 20 FSW 100%
O2, As per GUE and WPKK
MOD 70 FSW EAN50, As per GUE and WPKK
MOD 120 FSW Trimix 35/25, As per GUE and WPKK
MOD 190 FSW Trimix 21/35, As per GUE and WPKK
MOD 240 FSW Trimix 19/45, As per GUE and WPKK
MOD 300 FSW Trimix 12/70, As per GUE and WPKK |
| Travel Gas |
|
| PIg |
Pressure Inspired Gas |
| PTg |
Pressure Tissue Gas |
| PO2 |
Pressure of O2
at depth, see formula |
| PO2 = 1.1 - 1.2 |
Suggested
Maximum for back gases |
| PO2 = 1.5 |
A PO2 discussed
but not really used |
| PO2 = 1.6 |
Maximum PO2 for
Decompression Gases |
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Recommendations