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BUD OPERATING MANUAL
© 2002 Design, 2011 Doc. No. 12-5259-r01 (7/21/11)
FEATURES
ALGORITHM
The BUD is configured with 2 algorithms which allows you to choose which set of NDLs (No Deco Limits) will be used for nitrogen/oxygen calculations and
displays relating to Plan and DTR (Dive Time Remaining).
You can select to use either the DSAT or the Z+. The selection will lock in for 24 hours after the last dive.
DSAT features NDLs that are based on exposures and test data which also formed validation for the PADI RDP. It imposes restrictions for repetitive
Deco dives, considered more risky.
Z+ (Pelagic Z+) performance is based on Buhlmann ZHL-16c. It features NDLs that are considerably more conservative especially at shallower depths.
To create even greater margins of safety with respect to decompression a No Deco Safety Stop can be performed for No Deco dives.
SAFETY STOP (SS), No Deco only
Upon ascent to 20 FT (6 M) for 1 second on a No Deco dive in which Depth exceeded 30 FT (9 M) for 1 second, a SS to be taken at 15 FT (4.5 M) will
appear on the Main display with a countdown beginning at 3:00 (min:sec).
• In the event that you descend 10 FT (3 M) below the SS Depth for 10 seconds during the countdown, or the countdown reaches 0:00; the No Deco
Main will replace the SS Main which will reappear upon ascent to 20 FT (6 M) for 1 second.
• In the event that you enter Deco during the dive, complete the Deco obligation, then descend below 30 FT (9 M); the SS Main will appear again upon
ascent to 20 FT (6 M) for 1 second.
• If you surface during the SS countdown, the SS will be canceled for the remainder of that dive.
• There is no Penalty if you surface prior to completing the SS or ignore it.
DTR (DIVE TIME REMAINING)
The BUD constantly monitors No Deco status and O2 accumulation, and will display whichever Time is the least amount available as DTR on the No Deco
Dive Main screen. The Time being displayed will be identified by the NDC or O2 icon.
NDC (No Deco DTR)
NDC is the maximum amount of time that you can stay at your present Depth before entering Deco. It is calculated based on the amount of nitrogen ab-
sorbed by hypothetical tissue compartments.
The rates each of these compartments absorb and release nitrogen is mathematically modeled and compared against a maximum allowable nitrogen level.
Whichever one is closest to this maximum level is the controlling compartment for that Depth. Its resulting value (NDC) will be displayed as DTR and the
TLBG.
As you ascend, the TLBG segments will recede as control shifts to slower compartments.
This is a feature of the decompression model that is the basis for
multilevel diving, one of the most important advantages that Oceanic dive computers offer.
OTR (O2 TIME REMAINING)
When set for Nitrox operation, O2 during a dive is displayed on an ALT screen as a % of allowed saturation.
The limit for O2 exposure (100%) is set at 300 OTU (oxygen tolerance units) per dive or 24 hour period. As time before reaching the limit decreases, %
O2 increases and OTR (time allowed) decreases.
When OTR (time) becomes less than the NDC (time), calculations for the dive will be controlled by O2 and OTR will be displayed as DTR on the Dive
Main.