SUUNTO SPYDER User Manual

Page 47

will move downward and the ascent time will

increase. Likewise, the ceiling may change while

you are decompressing.
When the sea surface is rough, it may be diffi-

cult to maintain a constant depth near the sur-

face. 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 de-

compress below the ceiling than at the ceil-

ing.
Display below the Ceiling Zone
The CEILING/ASC TIME and upward pointing

arrow indicate that you are below the ceiling zone

(Fig. 4.19). You should start your ascent imme-

diately.
The ceiling depth is shown on the left side of the

center window and the minimum total ascent time

on the right side of the center window.

Fig. 4.19 Decompression dive,

below the ceiling zone. The

minimum ascent time is 5

minutes. The upward pointing

arrow tells you to ascend. The

ceiling is at 3 m [10 ft].