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MANTIS USER MANUAL
F
NOTE:
A fast descent from mountains
or a fast rise in airplane cabin pressure
may activate the dive mode. The
MANTIS will automatically detect
and end this “dive” after 12 hours or
you may manually activate the check
by press and hold both +/UP and -/
DOWN buttons at the same time. This
kind of false dive will not be stored in
the MANTIS logbook
.
4.8.8.2 Prohibited altitude
Going to altitude, as well as flying after
diving, exposes your body to a reduced
ambient pressure. Similar, in a way, to the
no-fly time, MANTIS advises you which
altitude classes are safe to reach after a
dive and which aren’t. If you have to drive
over a mountain pass to return home after
a dive, you can view this information in the
planner menu.
The current altitude class is shown on the left
top row and the prohibited altitude is shown on
the right. In the top example above, the diver
is presently at altitude class 0 and should not
reach altitudes above 3000m (class 3) within
given interval of 3 hours and 0 minutes.
By increasing the interval time on the middle
row the allowed altitude increases due to the
desaturation caused by the time spent at the
current altitude class (as shown on the lower
example).
F
NOTE: when the no repetitive dive
symbol is on, the planner on the middle
row initially shows the time period
when diving would be allowed again.
For planning the altitude excursion the
interval time can be reduced, which
causes the prohibited altitude level to
decrease.
MANTIS has an altitude warning: if you
were to reach an altitude that, according to
MANTIS is incompatible with your current
residual nitrogen levels, it will warn you with
an altitude warning.
4.8.8.3 Decompression dives in
mountain lakes
In order to assure optimal decompression
even at higher altitudes, the 3m/10ft
decompression stage is divided into a
2m/7ft stage and a 4m/13ft stage in
altitude ranges 1, 2 and 3.
If atmospheric pressure is below 610mbar
(altitude higher than 4000m/13300ft), no
decompression calculation is carried out
by MANTIS (automatic GAUGE mode). In
addition, the dive planner is not available in
this altitude class.
4.8.9
Warnings and alarms
MANTIS can alert you of potentially
dangerous situations via warnings and
alarms.
You can only modify the warning
and alarm settings via PC interface
.
Warnings
represent situations that require
the diver’s attention, but ignoring them
does not represent an immediate risk. It is
up to you to decide which ones you would
like to be active and which ones not. The
available warnings are:
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