Suunto D4 User Manual page 55

Display below the floor
The blinking ASC TIME and an upward pointing arrow indicate that you are below the
floor. You should start your ascent immediately. The ceiling depth is shown on the left
side, and the minimum total ascent time on the right side, of the center window. Below
is an example of a decompression dive without Deep Stops, below the floor.
Display above the floor
When you ascend above the floor, the ASC TIME display stops blinking and the upward
pointing arrow disappears. Below is an example of a decompression dive above the
floor.
Decompression will now begin, but is very slow. You should therefore continue your
ascent.
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UPWARD POINTING ARROW, BLINKING ASC
TIME AND AN ALARM TELL YOU TO ASCEND.
MINIMUM TOTAL ASCENT TIME INCLUDING SAFETY
STOP IS 4 MINUTES. CEILING IS AT 3 M.
UPWARD POINTING ARROW HAS
DISAPPEARED AND ASC TIME LABEL HAS
STOPPED BLINKING, MEANING YOU ARE IN
THE DECOMPRESSION RANGE.