To give a scale of total pressure changes
during an apnea dive session, MANTIS
includes a total depth counter. When your
depth total has been reached, MANTIS
notifies you at the surface with an audible
tone and a blinking “no dive” symbol to let
you know it’s to end the session and take
a break.
By pressing the SEL button in this menu
the off/depth selection starts blinking. By
pressing the +/UP or -/DOWN button this
can be edited from 100 to 1000m in 20m
increments (330..3300ft in 65ft increments)
and confirmed by pressing the SEL button.
4.4.2 Setting the surface interval
factor
Apnea diving organizations give various
recommendations about surface intervals
between dives based on dive times or
depths. MANTIS integrates a surface
interval counter which uses simple
multiplication for determining the surface
interval in seconds. MANTIS uses following
formula in this calculation:
Surface interval before the next dive = pressure
(depth) * square root of dive time * SIF
As a reference a few values are listed in the
following table:
Dive
depth
Dive
time
Surface Interval
m ft seconds seconds
(SIF = 5)
seconds
(SIF = 20)
10 30 40 63 253
10 30 60 77 309
20 60 60 116 464
30 90 80 178 716
40 120 90 237 949
F
NOTE: The actual depth and time
are calculated during the ascent and
descent, this is not presented in the
table above.
By pressing the SEL button in this menu
the off/value selection starts blinking. By
pressing the +/UP or -/DOWN button
the SIF can be selected from 5 to 20 or
disabled with the OFF setting which is then
confirmed by pressing the SEL button.
After a dive, if SIF is set, MANTIS will
indicate the surface interval with a static
“no dive” symbol until the time has elapsed
which is then followed by an audible tone.
4.4.3 Setting the dual depth alarm
By pressing the SEL button in this menu the
first depth starts blinking. By pressing the
+/UP or -/DOWN buttons you may select
the first depth alarm from 5 to 100 meters
(20..330 feet). By pressing SEL the first
value is confirmed and the second depth
starts blinking. Like the first, by pressing
the +/UP or -/DOWN buttons the second
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