SentinelAce
Contributor
I need to do some practice examples for the dive master. I have googled and can't find any. I was hoping I could do some then check my answers. Any advice?
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I did the first two. About to get on a boat so let me know if I did this right lol.
The first dive, I will be in pressure group Q with a surface interval for 40 min. The second pressure group would be I putting my max depth at 40'.
The second dive, I will be in pressure group Q. Since I want to be at that depth for 50 minutes my pressure group would be W. W does not intersect with Q so the surface interval would be 0
I need to do some practice examples for the dive master. I have googled and can't find any. I was hoping I could do some then check my answers. Any advice?
The NAUI tables repeat the Navy tables. The PADI tables are very different from them and are based on extensive independent research supervised by Dr. Spencer. The surface intervals are the primary reason--even the impetus--for the difference.Your answer to the second question above is correct based on the PADI dive table...NAUI states a Surface Interval must be a minimum of 10 minutes between dives and that the diver must consider the 2nd dive as a continuation of the first dive if the surface interval is less than 10 minutes long.
Some computers (Suunto in particular), if you attain the surface and re-descend within 5 minutes the computer will continue counting the dive time as a continuation of the previous dive instead of as a 2nd dive.
NAUI further recommends a minimum of 1-hour surface interval between dives.
The US Navy Dive Manual also recommends a minimum surface interval of 10 minutes between dives:
"9-9.1 Repetitive Dive Procedure. To use the repetitive dive procedure described below,
the interval on the surface between dives must be at least 10 minutes. If the surface
interval between dives is less than 10 minutes, add the bottom time of the two
dives and enter the decompression table at the deeper of the two depths."
The minimum surface interval displayed on the NAUI dive table is 10min while the PADI table shows a minimum of 0-2min. I can't find any reference for a PADI recommended minimal surface interval time except what the RDP table calculates.
-Z