SUUNTO Vyper Air - Manual (Page 70)

• The ceiling zone is the optimum decompression stop zone. It is the zone between
the minimum ceiling and 1.2 m/4 ft below the minimum ceiling.
• The floor is the deepest depth at which the decompression stop time will not in-
crease. Decompression will start when you pass this depth during your ascent.
• The decompression range is the depth range between the ceiling and floor. Within
this range, decompression takes place. However, it is important to remember that
the decompression will be very slow at, or close to, the floor.
The depth of the ceiling and floor depends on your dive profile. The ceiling depth will
be fairly shallow when you enter the decompression mode, but if you remain at depth,
it will move downward and the ascent time will increase. Likewise, the floor and ceiling
may change upwards while you are decompressing.
When conditions are rough, it may be difficult to maintain a constant depth near the
surface. In such cases, it is more manageable to maintain an additional distance below
the ceiling, to ensure that the waves do not lift you above the ceiling. Suunto recom-
mends that decompression takes place deeper than 4 m/13 ft, even if the indicated
ceiling is shallower.
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