Altitude Adjustability
When programming the
IQ-400
for the correct altitude, the diver needs to
select the correct altitude mode according to Table 3.2. As a result the
IQ-400
adjusts its mathematical model according to the entered altitude, giving shorter
no-decompression times at higher altitudes (Tables 6.1 and 6.2).
The entered personal/ altitude adjustment mode is indicated by A0, A1, or A2.
Section 4.3, Personal/ Altitude Adjustment Setting describes how the altitude
mode is adjusted.
Table 3.2 Altitude Ranges.
Altitude Mode
Altitude Range
A0
0 – 700 m
[0 – 2300 ft]
A1
700 – 1500 m
[2300 – 5000 ft]
A2
1500 – 2400 m
[5000 – 8000 ft]
Personal Adjustability
The factors, which tend to increase the possibility of decompression sickness,
include but are not limited to:
• cold exposure — water temperature less than 20 ˚C [68 ˚F]
• the diver is below average physical fitness level
• multiday or repetitive dive exposure
• diver fatigue
• dehydrated conditions
• previous history of decompression sickness
This feature should be used to adjust the computer to intentionally introduce a
factor to make it more conservative according to personal preference by enter-
ing a higher altitude mode than required in table 3.2 (i.e. diving at sea level
26
WARNING
THE
IQ-400
IS NOT INTENDED FOR USE AT
ALTITUDES GREATER THAN 2400 m (8000 ft)!
Traveling to a higher elevation can temporarily cause a change
in the equilibrium of dissolved nitrogen in the body with the
surroundings. It is recommended that the diver allow the body
conditions to stabilize over a period of at least three hours
before beginning to dive at altitude.
!
!
