Suunto D6 User Manual page 63

WARNING
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.
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.
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.
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