1) 1 What pressure group would a diver be in after a 15 minute dive to a depth of 70 feet?

15 minutes is on it and then go across and you’ll see pressure group E

2) What pressure group would a diver be in after a dive to 45 feet for 50 minutes?

Go across and you’ll see you’re in pressure group P

3) A diver does a dive to 80 feet for 20 minutes. What is his pressure group after a 22 minutes surface interval?

4) A diver does a series of dives and is in Pressure group L. What will his pressure group be after a surface interval of 40 minutes?

5) What is the ending pressure group for the following 2 dives?

First you dive to 48 feet for 25 minutes. Surface interval of 30 minutes then dive to 40 feet for 1 hour.

Go to 50’ then down to 26 min you’re in pressure group G.After Surface Interval, you’re in pressure group D .

Go to Side 2. Since 2nd dive is to 40’ Go to 40' and find where it intersects with pressure group D. To find the RNT (Residual Nitrogen Time) which is in the white box. Which is 25 min. Add the RNT of 25 to the ABT (Actual Bottom Time) of the dive (in this case 60 min(1 hour)) for a TBT (Total Bottom Time) OF 85 MIN.

Go back to Side 1 and 40’depth for time of 85 minutes(TBT)

6) A diver does a dive to 55 feet for 46 minutes. Surface interval of 1 hour followed by a dive to 50 feet for 45 minutes.

What is her ending pressure group?

Side 1, Go to 60 foot depth because there's no 55'.

Go down to find 46 minutes. There is no 46 so you must go to 47.Go across table from 47 and you see you are in (PG) Pressure Group S. Go across from S and find your surface interval time of 1 hour. You find a box with :57 & 1:03. (57 minutes & 1 hour 3 minutes) 1 hour falls inbetween so that's the column you use.

Go Down the column and it shows what (PG) pressure group you're in after the surface interval. In this case it is

Now go to side 2 to figure out the RNT, (Residual time). Find where the depth of dive 2 (50 feet) and the beginning pressure group of G intersect.

Residual is the white box at the intersect of 50 & G and is 26 minutes.

Figure out the RAT!. R plus A = T. (Residual plus actual = TOTAL. )

Add the Residual of 26 to the Actual bottom time of 45 minutes and you get a TOTAL bottom time of 71 minutes.

Go back to side 1. Find depth of second dive (50 feet) and go down to the TOTAL bottom time of 71 minutes and you find you are in pressure group (PG) V

7) What is the ending pressure group after the following 3 dives?

Dive to 80 for 22 minutes followed by a 45 minute surface interval

Dive to 60 feet for 30 minutes followed by a 50 minute surface interval

Dive to 50 feet for 25 minutes.

8) What would your ending pressure group be after the following scenario:

Dive to 87 feet for 20 minutes Surface interval of 1 hour and 6 minutes

Dive to 60 feet for 40 minutes. Surface interval of 1 hour

Dive to 42 feet for 35 minutes

9) What is the maximum allowable bottom time for a dive to 72 feet?

10) What is the maximum allowable bottom time for a depth of 100 feet ?

11) You do a dive to 62 feet for 25 minutes. After a surface interval of 40 minutes you want to dive to 46 feet.

What is the maximum allowable bottom time for the second dive?

Calculate all info given.

2nd dive you start in pressure group F. Dive is to 46’. Side 2 where 50’ and F intersect the ANDL (blue box) is 56 min.

12) On vacation in the Bahamas you do 2 dives. Dive 1 is to 71 feet for 20 minutes. Dive 2 is to 60 feet. If you have a surface interval of 20 minutes what is your maximum allowable bottom time for dive 2?.

13) While on vacation you do 2 boat dives in the morning.

1st dive to a wreck in 90 feet for 20 minutes. Then a 38 minute surface interval 2nd dive on a coral reef to 51 feet for 30 minutes.After lunch you and your buddy decide to do a shore dive behind the hotel. The reef there is 47 feet.

You check your computer and it shows a surface interval of 2 hours and 6 minutes.

What is the maximum allowable bottom time for the third dive?

14) Minimum surface Interval

What is the minimum surface interval required for a dive to 50 feet for 50 minutes and another dive to 50 feet for 40 minutes?

15) What is the minimum surface interval between these 2 dives.

Dive to 80 feet for 25 minutes and a dive then to 51 feet for 42 minutes?

16) A divers non-diving friend is getting married on a summer Saturday. The ceremony ends at 11:OO AM. The reception begins at 4 PM so the diver figures he can squeeze in a quick dive or two. If her first dive is to a depth of 70 feet for 30 minutes, what is the minimum surface interval for a second dive to 60 feet for 35 minutes?

17) A diver makes a dive to 70 feet for 33 minutes.He waits for a surface interval of 32 minutes before diving to the same depth (70 feet).Forgetting to monitor his bottom time he finally checks his watch and discovers he’s been diving for 24 minutes. According to the RDP, what should the diver do in this situation?

( Look at Emergency Decompression Procedures on back of the RDP)

They are asking you to figure out how long the diver went past his ANDL (Adjusted No Deco Limit) for the second dive.Remember, an Adujusted No Deco limit is the maximum time you can stay at a specific depth with a specific beginning pressure group on a repetitive dive.

Once you figure out the ANDL you need to remember, or look at the Emergency Decompression Rules and follow them.

So you do dive # 1 just as you always do. Then do dive # 2 but instead of figuring out the RAT for dive # 2, look up the ANDL (blue box that corresponds with the beginning pressure group of dive #2 and the depth of dive #2.

In this case depth is 70 feet and (pg) J.

The ANDL is 18 minutes. Since he stayed at 70 feet for 26 minutes he went past his ANDL by 6 minutes(26 - 18 = 6).

18) A group of advanced divers plan 2 dives on Long Island shipwrecks.

One dive is to the artificial reef near Shinnecock. They plan to dive to 70 feet for 30 minutes.

The other dive is to the U.S.S. San Diego and plan a 110 foot dive for 10 minutes.

Surface interval will be 1 hour and 45 minutes.

Which dive should they plan to do first?

19) You dive in water near freezing temperatures. Your dive plan is to dive to 72 feet for 20 minutes.

What profile would you use with the RDP to plan this dive?

(In cold water plan your dive as if it was 10 feet deeper. Therefore 82’ for 20 minutes, you’d go to 90 ‘ on the RDP

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