Page 44
Doc. 13301-Tec-RevB (2022-05-25)
Technical Modes
Operating Instructions
GTR Display
The Gas Time Remaining display shows the time, in
minutes, that you could stay at the current depth until
a direct ascent to the surface at a speed of 33 feet/
min (10 m/min) would result in surfacing with the
reserve gas pressure remaining�
The Value is displayed in yellow when less than or
equal to 5 minutes� The value is displayed in red when
less than or equal to 2 minutes�
GTR can only be based on a single tank or when
sidemount is selected, with 2 tanks of identical
volume�
The title indicates which transmitter is being used
for the GTR calculations in a dark gray font� “SM”
indicates that Sidemount GTR is selected�
When on the surface, the GTR displays “---”�
GTR is
not shown when decompression stops are needed,
and will display “deco”.
SAC data from the first 30 seconds of each dive is
discarded� It then takes an additional few minutes to
calculate the average SAC� Therefore, for the first few
minutes of each dive, the GTR will display “wait”, until
enough data has been collected to begin making GTR
predictions�
More information on how GTR is calculated can be
found in the GTR calculations section on page 48�
GTR
wait
T1
GTR
T1
---
No GTR
on surface
At start of dive,
wait for data to
stabilize
The title indicates which transmitter is being used
for the SAC calculations in a dark gray font� “SM”
indicates that Sidemount SAC is selected�
The tank(s) included in the SAC calculation are
selected in the AI Setup menu (page 65)�
During the first few minutes of a dive
the SAC value is not available, while the
initial data is being collected for averaging
calculations� The SAC display will show
“wait” during this time�
SAC Display
The Surface Air Consumption (SAC) display
shows the average rate of pressure change
over the last two minutes, normalized to
as if at 1 ATA pressure� Depending on the
current units setting, SAC is either displayed
in psi/minute or bar/minute�
SAC can be displayed for a single tank, or
for a sidemount configuration of two tanks
of identical volume�
On surface, SAC is average from last
dive
The average SAC from your last dive is shown
when on the surface� When a dive ends, you may
notice the SAC value suddenly changes� This is
because the SAC display changes from showing
the SAC over the last two minutes (when in
dive mode) to showing the average SAC for the
whole dive�
Note that SAC in pressure per minute
is NOT transferable between tanks of
different sizes�
GTR
T1
45
GTR
T1
5
GTR
T1
2
SURFACE
TTS
OC 18/45 0 0
O2/HE
NDL
.0
DEPTH
TIME
10
h
58
m
SAC
T1
1.1
R
T2
207
B
A
0
%
SurGF
Bar
min
SURFACE
TTS
OC 18/45 0 0
O2/HE
NDL
.0
DEPTH
TIME
10
h
58
m
SAC
SM
0.8
R
T2
207
B
A
0
%
SurGF
PSI
min
SURFACE
TTS
OC 18/45 0 0
O2/HE
NDL
.0
DEPTH
TIME
10
h
58
m
SAC
T1
R
T2
207
B
A
0
%
SurGF
wait