The Recreational Dive
Planner
Instructions for Use
Jane E. Spencer
MSDT 45434
Sample Problems - Table 1
 A dive to 43 feet for one hour yields
what pressure group?
43’
:60
Sample Problems - Table 1
 A dive to 43 feet for one hour yields
what pressure group?
S
43’
:60
Sample Problems - Table 1
 A dive to 28 feet for 70 minutes
yields what pressure group?
28’
:70
Sample Problems - Table 1
 A dive to 28 feet for 70 minutes
yields what pressure group?
N
28’
:70
Sample Problems - Table 1
 A dive to 60 feet for 40 minutes
yields what pressure group?
60’
:40
Sample Problems - Table 1
 A dive to 60 feet for 40 minutes
yields what pressure group?
Q
60’
:40
Sample Problems - Table 2
 After a dive you are in pressure group J. What
will your new pressure group be after a 32
minute surface interval?
J
:32
Sample Problems - Table 2
 After a dive you are in pressure group J. What
will your new pressure group be after a 32
minute surface interval?
J
:32
E
Sample Problems - Table 2
 A diver in pressure group P will be in what
pressure group after a 55 minute surface
interval?
P
:55
Sample Problems - Table 2
 A diver in pressure group P will be in what
pressure group after a 55 minute surface
interval?
P
:55
F
Sample Problems - Table 2
 A diver in pressure group I will be in what
pressure group after a surface interval of four
hours?
P 4:00
Sample Problems - Table 2
 A diver in pressure group I will be in what
pressure group after a surface interval of four
hours?
P 4:00 A
Sample Problems - Table 3
 If you are in pressure group K after your
surface interval, and you are planning a dive to
60 feet, what is your adjusted no
decompression limit?
K
60’
Sample Problems - Table 3
 If you are in pressure group K after your
surface interval, and you are planning a dive to
60 feet, what is your adjusted no
decompression limit?
K
60’
29
26
ANDL = 26
Sample Problems - Table 3
 After a surface interval you are in pressure
group P and planning a dive to 50 feet. What is
your adjusted no decompression limit?
P
50’
Sample Problems - Table 3
 After a surface interval you are in pressure
group P and planning a dive to 50 feet. What is
your adjusted no decompression limit?
P
50’
50
30
ANDL = 30
Sample Problems - Table 3
 If you’re in pressure group M after a surface
interval, what is the residual nitrogen time if
you’re planning a repetitive dive to 60 feet?
M
60’
Sample Problems - Table 3
 If you’re in pressure group M after a surface
interval, what is the residual nitrogen time if
you’re planning a repetitive dive to 60 feet?
M
60’
33
22
RNT = 33
Sample Problems - Table 3
 Following a surface interval, you’re in pressure
group T. What would be your RNT for a
repetitive dive to 50 feet?
T
50’
Sample Problems - Table 3
 Following a surface interval, you’re in pressure
group T. What would be your RNT for a
repetitive dive to 50 feet?
T
50’
63
17
RNT = 63
Drawing the Dive Profile
 Avoid confusion and make sure you don’t miss
steps.
Surface Interval
Pressure Group
after Dive 1
between dives
(hours and minutes)
Pressure Group
after Surface
Interval
Pressure Group
after Dive 2
:
Depth
RNT
Depth
+ABT
TBT
Bottom Time
Dive 1
Bottom Time
Dive 2
Find the RAT!
Planning Multiple Repetitive Dives
 Indicate the final pressure group upon
surfacing after the following series of dives.
M
1:00
D
40’
50’
Depth
+ABT
25
+60
TBT
85
RNT
Depth
40
S
60
Planning Multiple Repetitive Dives
 Indicate the final pressure group upon
surfacing after the following series of dives.
:24
50’
55’
Depth
RNT
Depth
50
+ABT
30
TBT
+
Planning Multiple Repetitive Dives
 Indicate the final pressure group upon
surfacing after the following series of dives.
U
:24
O
50’
55’
Depth
+ABT
47
+30
TBT
77
RNT
Depth
50
X
30
Minimum Surface Interval
 Find the minimum surface interval required to
complete the following series of dives.
:
60’
60’
Depth
RNT
Depth
40
+ABT
40
TBT
+
Minimum Surface Interval
 Find the minimum surface interval required to
complete the following series of dives.
Q
1:21
C
60’
60’
Depth
RNT
Depth
40
+ABT
40
TBT
+
Minimum Surface Interval
 Find the minimum surface interval required to
complete the following series of dives.
:
40’
50’
Depth
RNT
Depth
60
+ABT
70
TBT
+
Minimum Surface Interval
 Find the minimum surface interval required to
complete the following series of dives.
S
:11
P
40’
50’
Depth
RNT
Depth
60
+ABT
70
TBT
+
Special Rules
 Flying after diving – wait 12 hours or for
repetitive dives and/or multiple days wait
18 hours (suggested)
 Cold – add 10 feet
 1000’ altitude limit for RDP
 Safety Stop – always do a safety stop
 A Safety Stop is REQUIRED for dives 100’
plus or within three letter groups of NDL, or
NDL
 Ascend no faster than 60 feet per minute
Emergency Decompression
 If a no decompression limit is exceeded by
no more than 5 minutes, an 8 minute
decompression stop at 15 feet is
mandatory. Upon surfacing the diver must
stay out of the water for at least 6 hours.
 If a no decompression limit is exceeded by
more than 5 minutes a 15 foot
decompression stop at 15 feet is urged (air
supply permitting). Upon surfacing the
diver must remain out of the water for at
least 24 hours before making another dive.