42
MANTIS USER MANUAL
period when you should not have another
immersion due to possible micro bubbles,
high CNS or excessive nitrogen loading in
your body.
By pressing the SEL button the following
page shows the no-fly symbol, with the
count-down time on the top row, until the
restriction is completed.
The interval from the last dive is shown on
the middle row with the text INT.
Acceptable altitudes are shown at the
first page of the planner menu. Prohibited
altitudes (the altitudes MANTIS has
computed to be incompatible with your
current nitrogen saturation levels) are levels
above the second altitude on the display.
Please read section Altitude and the
decompression algorithm for more details.
The current altitude and altitude class
can be read on the altitude meter menu:
Reading the Altitude, Barometer and
Temperature values
.
F
NOTE:
The no-fly, no-dive and altitude
restriction symbols are also shown
on the time of the day display when
applicable
.
WARNING
Flying while MANTIS displays the NO FLY symbol
can result in serious injury or fatal issue.
4.8.8.1 Altitude and the
decompression algorithm
Atmospheric pressure is a function of
altitude and weather conditions. This is an
important aspect to consider for diving,
because the surrounding atmospheric
pressure has an influence on on-gassing
and off-gassing of nitrogen in your body.
MANTIS divides the possible altitude range
into 5 classes that are illustrated in the
picture below:
Altitude Class
Elevation Barometric
switch point
Dive computer
mode
GAUGE
(no deco data)
SCUBA
SCUBA
SCUBA
SCUBA
The altitude classes are approximate
elevations because the effect of weather
conditions can make the switch point
pressure occur at different levels.
WARNING
At altitude class 4 MANTIS functions in gauge mode
only (automatic switch from computer mode).
F
NOTE:
You can check your current
altitude class and elevation by
activating the altitude meter. Refer
to chapter
Reading the Altitude,
Barometer and Temperature
values
on how to do so
.
F
NOTE:
MANTIS deals with altitude
automatically: it monitors the
atmospheric pressure every 60
seconds and if it detects a sufficient
drop in pressure, it does the following:
it indicates the new altitude range and,
if applicable, the prohibited altitude
range; it indicates the desaturation
time, which in this case is an
adaptation time to the new ambient
pressure. If a dive is started during this
adaptation time, MANTIS considers it
a repetitive dive, since the body has
residual nitrogen
.
Summary of Contents for MANTIS
Page 1: ... MANTIS User Manual ...
