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Answers to RDP
Practice Questions
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PADI Recreational
Dive Planner
1) 1 What pressure group would a
diver be in after a 15 minute dive to a depth of 70 feet?
answer a)
E
Side 1 RDP, find 70 foot mark, go down until you find the exact
time or next greater time if exact time not listed. 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?
answer c) P
Side 1 RDP Need to go to 50 feet cause there is no 45
foot depth mark. Then go down until find 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?
answer b) H
Side 1,Go to 80' and then down to 20 minutes. Go
across you see pressure group K. Then go across until you find where 22 minutes
falls in on table 2 of side 1. You'll find a box with 0:17 and 0:22. Follow
down to pressure group on bottom and it's pressure group H
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?
answer a) F
Start on pressure group L: on left side and go
across until find where 40 minutes falls. You find 0:35 and 0:42. Follow down
to pressure group F
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.
answer d)
S
Figure out the RAT! 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)TOTAL Bottom
Time pressure group is S.
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?
answer c ) V
Figure out the RAT! 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 G . 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.
answer a) Q
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
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