Suunto D5 User Manual page 23

Suunto D5
1. There is a decompression window (Deco window) that is the distance between the
decompression ceiling (Deco ceiling) plus 3.0 m (9.8 ft) and the decompression ceiling. So
the decompression window in this example is between 20.7 m (68 ft) and 17.7 m (58 ft).
This is the area where decompression takes place. The closer to the ceiling you stay, the
more optimal the decompression time is.
When you ascend close to the ceiling depth and enter the decompression window area,
two arrows appear in front of the depth number. The downward and upward pointing
white arrows indicate that you are within the deco window.
2. If you ascend above the ceiling depth, there is still a safe margin area, equaling to ceiling
depth minus 0.6 meters (2 ft). So in this example, it is between 17.7 m (58 ft) and 17.1 m (56
ft). In this safe margin area, decompression calculation still continues, but you are advised
to go down below ceiling depth. This is indicated by the ceiling depth number turning
yellow with a downward pointing yellow arrow in front of the depth number.
3. If you go above the safe margin area, the decompression calculation is paused until you
go back down below this limit. An audible alarm and a red downward arrow in front of the
depth number indicate unsafe decompression.
If you ignore the alarm and stay above the safe margin for three minutes, Suunto D5 locks
the algorithm calculation, and decompression information will not be available anymore on
the dive. See 3.2. Algorithm lock.
Decompression display examples
Below is a typical decompression dive view showing ascent time and the first required deep
stop at 20.3 meters:
Suunto D5 shows the ceiling value always from the deepest of these stops. Deep stop and
safety stop ceilings are always at constant depth when you are at the stop. Stop time is
counted down in minutes and seconds.
In the below display, the stop depth is set to 9.0 m and the diver is currently at 9.1 m. White
arrows beside the depth value show the diver is inside the stop window. 1' 28 is shown in a
yellow field in the switch window as the time for an optional stop:
The below display shows that the stop depth is set to 3.0 m and the diver is at 3.6 m. The
white arrows indicate again that the diver is inside the stop window. 3' 29 is shown in a red
field in the switch window as the time for a compulsory stop:
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