Specifications

38
WARNING: The Planning Sequence predicts only no decom-
pression times for subsequent dives. Depending on cylinder
size, breathing gas consumption, and oxygen accumulation, you
may have less time available than indicated because of breath-
ing gas quantity or other limitations.
To access the Planning Sequence while in the Surface Mode:
• press the Advance (Left) button 3 times (prior to a day's first dive), or -
• press the Advance (Left) button 4 times (if a dive has been made)
• press repeatedly, or press and hold, the Select (Right) button
• a sequence of depths from 30 to 160 feet (9 to 48 meters) in 10 foot (3
meter) increments will be displayed together with the 'predicted' no de-
compression limit for that depth (Fig. 36).
No decompression times are only displayed for depths where there is at least 3
minutes of dive time available at the depth, taking into account a descent rate
of 120 feet (36 meters) per minute. Depths greater than the maximum depth
that can be achieved with a partial pressure of oxygen (PO2) of 1.60 ATA will
not be displayed.
The unit reverts to Surface Mode 2 minutes after the Select (Right) button is
released, unless the Advance (Left) button is pressed to access the Log Mode.
Fig. 36 - No Decompression
Limits (NDLs)
500AI NDLs
Depth minutes
feet (meters) Eng (Metric)
30 (9) 260 (283)
40 (12) 137 (144)
50 (15) 80 (84)
60 (18) 57 (58)
70 (21) 40 (41)
80 (24) 30 (31)
90 (27) 24 (26)
100 (30) 19 (20)
110 (33) 16 (16)
120 (36) 13 (13)
130 (39) 10 (11)
140 (42) 9 (9)
150 (45) 8 (8)
160 (48) 7 (7)