27
ALTITUDE DIVING
The mathematical model within the DataMax Pro accounts for the
reduced no-decompression time available at higher elevations based on
NOAA (National Oceanic and Atmospheric Administration) guidelines.
When diving in high altitude lakes or rivers (from 4,000 to 14,000 feet), the
DataMax Pro will automatically adjust to these conditions providing cor-
rected depth and reduced no-decompression times. Over 4,000 feet, depth
calibration is automatically changed to read in feet of freshwater rather than
feet of seawater.
WARNING: Until it has shut itself off, you must not use the
DataMax Pro at a different altitude than the altitude where it
was originally activated. Doing so will result in an error equal
to the difference in barometric pressure, and possibly a false
dive mode.
FLYING AFTER DIVING
In 1990 the Undersea and Hyperbaric Medical Society published a set of
guidelines aimed at minimizing the possibility of decompression sickness due
to flying too soon after diving. The UHMS suggests* divers using standard
air tanks and exhibiting no symptoms of decompression sickness wait 24
hours after their last dive to fly in aircraft with cabin pressures up to 8,000 ft.
The only two exceptions to this recommendation are:
1) If a diver had less than 2 hours total accumulated dive time in the last 48
Fig. 23 – Time to Fly
countdown
®
DataMax
PRO
®
N
O
D
E
C
O
M
C
Z
.
.
1
0
F
T
S
T
O
P
2
0
F
T
3
0
5000 40003000
T
I
M
E
T
A
N
K
A
S
C
E
N
T
4
0
* excerpted from “The UHMS Flying After Diving Workshop”
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