33
4 Functions during the Dive
III Uwatec
®
Aladin
®
Sport Plus
American
III
4.4 Ascent rate
Optimal ascent rate varies depending on depth between 23 and 67 ft/min. It is displayed in percent of the
reference variable. If the ascent rate is greater than 100% of the set value, the black arrow <SLOW>
appears. If the ascent rate exceeds 140%, the arrow starts flashing.
Ascent rate
Optical alarm
The prescribed ascent rate must be observed at all times! Exceeding the pre-
scribed ascent rate can lead to microbubbles in the arterial circulation which
can lead to serious injury or death due to decompression sickness.
Excessive ascent rates of longer periods are entered in the logbook.
Response: Reduce ascent rate.
– The Aladin
®
Sport Plus may require a decompression stop even within the no-
stop phase because of the danger of the formation of microbubbles due to an
improper ascent.
– Decompression time necessary for the prevention of microbubbles can increa-
se massively if the ascent rate is exceeded.
– At great depth, too slow an ascent may cause heightened saturation of tissu-
es and an extension of decompression time. At shallow depth, a slow ascent
may shorten decompression time because the tissues are desaturating during a
shallow, slow ascent.
S
L
O
W
SPEED
%
S
L
O
W
SPEED
%
WARNING
S
L
O
W
SPEED
%
depth
dive time
max. depth
deco info
NO STOP
WARNING
