SUUNTO Stinger - Manual (Page 44)

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When conditions are rough, it may be difficult to
maintain a constant depth near the surface. In this case
it will be more manageable to maintain an additional
distance below the ceiling, to make sure that the waves
do not lift you above the ceiling. Suunto recommends
that decompression takes place deeper than 4 m [13 ft],
even if the indicated ceiling is shallower.
NOTE: It will take more time and more air to
decompress below the ceiling than at the ceiling.
WARNING
Never ascend above the ceiling! You must not
ascend above the ceiling during your
decompression. In order to avoid doing so by
accident, you should stay somewhat below the
ceiling.
Fig. 3.17. Decompression dive,
below floor. Upward pointing
arrow, blinking ASC TIME label
and an audible alarm tell you to
ascend. Minimum total ascent
time including safety stop is 7
minutes. Ceiling is at 3 m [10 ft].
Fig. 3.18. Decompression dive, above floor. Upward pointing
arrow has disappeared and ASC TIME label has stopped blinking,
which means that you are in the decompression range.