SUUNTO SPYDER - Manual (Page 45)

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tion required for ascent. After this the Spyder will continue to provide subsequent
interval and repetitive dive information.
Rather than requiring you to make stops at fixed depths, the Spyder lets you to
decompress within a range of depths (Continuous Decompression).
Background
When your NO DEC TIME becomes zero, your dive becomes a decompression
dive, i.e. you must perform one or several decompression stops on your way to the
surface. The NO DEC TIME on your display will be replaced by a notation CEIL-
ING/ASC TIME.
WARNING!
YOU SHOULD ASCEND AND BEGIN DECOMPRESSION IMMEDIATELY
WHEN THE SPYDER SHOWS YOU THAT DECOMPRESSION IS RE-
QUIRED! Note the upward pointing arrow.
The ascent time (ASC TIME) is the minimum amount of time needed to reach the
surface in a decompression dive. It includes:
the time needed to ascend to the ceiling at an ascent rate of 10 m/min
[33 ft/min]
plus
the time needed at the ceiling. The ceiling is the shallowest depth to which
you should ascend
plus
the time needed to reach the surface after the ceiling has been removed.