Shearwater Petrel 2 How to use

Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v84 Release Notes
VERSION 84 2021-07-21
NOTE
The NERD 2, Petrel 2, Perdix, Perdix AI, and Peregrine share a common firmware
base. Due to hardware differences, not all features are available on all models. The
following changes apply to all models unless otherwise noted.
!
This is a major feature release update.
NEW Configurable Mini displays have been added. These
allow up to 3 displays to be shown in the area
normally used for 1 display, although at a smaller font
size.
Two Mini display sets can be configured. The set
configurations are separate for the tec modes (OC
Tec, CC/BO) and the rec modes (Air, Nitrox, 3 GasNx).
(all models)
2021-07-21
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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v84 Release Notes
VERSION 84 2021-07-21
NEW Up to 4 wireless air integration (AI) tanks are now
supported. Shearwater recommends use of the Swift
transmitter when more than 2 transmitters are used
to avoid communications channel conflicts.
The setup menu for AI has been restructured to allow
4 transmitters to be configured.
(Perdix AI and
NERD 2)
NEW Previews of the tec center row display configuration
have been added to make display setup easier.
Also, more options are available in the tec modes
center position.
(all models)
2021-07-21
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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v84 Release Notes
VERSION 84 2021-07-21
NEW
NEW
AI tanks can now be renamed. Only 2 characters
available per tank.
First character: T, S, B, O, or D
Second character: 1,2,3, or 4
DCIEM decompression model now available on some
dive computer models.
Only available for Air and Single Gas Nitrox open
circuit diving.
An additional fee is required to unlock this feature.
Contact your Authorised Shearwater Dealer for more
information.
(Perdix AI and
NERD 2)
(Open Circuit
Air and Nitrox
only)
NEW A sidemount mode has been added.
The differences in sidemount mode are:
• Reminder indicators are shown to prompt
switching tanks.
• SAC and GTR are calculated on the pooled gas
quantity of the two tanks. The tanks must be the
same size.
• A RTR (Redundant Time Remaining) display
option has been added. This is the GTR calculated
only on the tank with less pressure (i.e. the GTR if
the higher pressure tank was lost).
(Perdix AI and
NERD 2)
2021-07-21
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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v84 Release Notes
VERSION 84 2021-07-21
NEW Bailout CCR PPO2 monitoring option added.
When the Dive Mode is CC/BO, the PPO2 Mode
can be set to “BO CCR” (other options are “Int” and
“Ext”).
The BO CCR option is a combination of Int and Ext.
• The external PPO2 cell measurements are
displayed in the center row.
• However, the internal PPO2 setpoint is used for
decompression and CNS calculations.
This allows the BO CCR to follow the decompression
schedule of the primary CCR, while still displaying
the current loop PPO2, in case the diver needs to
start breathing from the BO CCR.
If the diver does switch to the BO CCR, they should
not switch from “CC” to “BO” (since that BO is
open-circuit bailout). Instead, the PPO2 Mode can
be left as “BO CCR” if the PPO2 is close the internal
setpoint. This produces similar decompression
schedules in most situations. For best decompression
accuracy, the PPO2 Mode can be changed to “Ext”.
(External
PPO2
monitors
only)
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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v84 Release Notes
VERSION 84 2021-07-21
Gas density display is now available.
It is only available in the configurable main screen
display. It shows gas density in g/L.
For Closed Circuit Diving:
The gas density display turns yellow at 5.2 g/L and
red at 6.3 g/L. No other warnings are generated.
For Open Circuit Diving:
The gas density display turns yellow at 6.3 g/L. No
other warnings are generated.
You may be surprised at how shallow these warning
colors appear. Read more about why we chose these
levels starting on page 66 here (recommendations
on page 73):
Anthony, T.G and Mitchell, S.J. Respiratory
physiology of rebreather diving. In: Pollock NW,
Sellers SH, Godfrey JM, eds. Rebreathers and
Scientific Diving. Proceedings of NPS/NOAA/DAN/
AAUS June 16-19, 2015 Workshop. Durham, NC; 2016.
The stack timer remaining time can now count
negative. Previously it counted down to zero and
then stopped there.
(all models)
(CCR modes
only)
NEW
NEW
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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v84 Release Notes
VERSION 84 2021-07-21
Gradient Factor rules have changed.
No longer enforces that GF_High must be <= 90 when GF_Low is > 50. The only
rules are now:
• GF Low must be less than or equal to GF High.
• GF High must be greater than 30.
• GF Low must be greater than 10.
These are the same rules as used on the Teric.
Fixed a small battery level display glitch that was present when the Li-Ion battery
type is used and is fully charged.
Allows firmware to be sent immediately after the dive log manifest list has been
sent.
Stack timer no longer resets when editing the total stack time. The used time
remains unchanged after total time is edited.
CHANGE
CHANGE
(CCR modes
only)
(all models)
FIX
FIX
(Perdix and
Petrel)
(all
models)
2021-07-21
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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v83 Release Notes
VERSION 83 2020-12-14
VERSION 82
NOTE
Only for Petrel 2.
This is a critical update. All Petrel 2 users should update if using v81.
!
NOTE
Version 82 was not publicly released.
!
Fixes an issue that could occur during battery change where under certain
conditions after a battery change the tissues integrity check could be bypassed
resulting in corrupted decompression tissues. This resulted in an obviously incorrect
display of a decompression stop depth of “OVR” while on the surface. This issue
only affected the Petrel 2 and only on firmware v81.
FIX
(Petrel 1
Only)
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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v81 Release Notes
VERSION 81 2020-09-08
NOTE
A note on models: The NERD 2, Petrel 2, Perdix, Perdix AI, and Peregrine share a
common firmware base. Due to hardware differences, not all features are available
on all models. The following changes apply to all models unless otherwise noted.
!
This is the first release for non-Peregrine products since v72. The initial Peregrine firmware
(v78) introduced many new features for all products. Please see v78 release notes below if
you are updating a non-Peregrine product.
This firmware is not being released for the Petrel 1 dive computer. The Petrel 1 model, sold from
2012 to 2014, has reached memory limitations for adding new features.
NEW
Fixed issue that would not allow @+5, delta+5, or CEIL to be configured in bottom
row.
Fixed issue that prevented Bluetooth connection to some third-party log software
(e.g. libdivecomputer/Subsurface).
Peripheral serial numbers now show when viewing details of a device in the Bus
Devices list.
Adds features that were first released with Peregrine v78. See v78 release notes
below.
(DiveCAN
CCR
Controllers
only)
CHANGE
(all non-
Peregrine
models)
FIX
FIX
(Peregrine
Only)
(Peregrine
Only)
OC REC mode users
After updating please confirm the PPO2 MOD value is set
to your desired value. This may change for some users
after updating.
IMPORTANT NOTICE
!

VERSION 78 2020-07-23
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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v81 Release Notes
VERSION 73 TO 78 2020-07-23
NOTE
Versions 73 to 78 were not publicly released.
!
NOTE
Version 78 was released only for the Peregrine.
!

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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v81 Release Notes
VERSION 78 2020-07-23
New single-gas modes added:
• AIR: Only a single fixed gas (21% O2 a.k.a. air) is
available. Simplifies menus and chances for errors
when only diving with air.
• Nitrox: For single gas nitrox from 21% to 40%.
• 3 GasNX: The 3 gas nitrox mode is simply a
renaming of the existing “OC Rec” mode. Allows 3
gases from 21% to 100% O2.
CHANGE
(all models,
except CCR
controllers)
NEW Added support for Peregrine hardware.
(Peregrine
Only)

2021-07-21
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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v81 Release Notes
VERSION 78 2020-07-23
Added user configurable “Alerts”. These can be
programmed to provide a warning when specified limit
is reached. Also, the applicable display on the main
screen will change to yellow while limit is exceeded.
On the Peregrine, the vibration will activate with the
warning.
CHANGE
(all models)

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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v81 Release Notes
VERSION 78 2020-07-23
NEW
NEW
Added “Last Dive” display to show basic info from last
dive (maximum depth, dive time, and #). Press right
button once when on surface to view.
Added Rate display. Can be added to configurable
display locations. Shows ascent or descent at higher
resolution than the ascent bar graph. Arrow points up
when ascending to surface, and points down when
descending.
Color coding is applied only during ascents and follows
the same rules as the existing ascent rate bar graph:
(All
Models)
(All
Models)
Color Ascent Rate
ft/min m/min
Default 0 to 35 0 to 10.5
Yellow 36 to 65 10.6 to 19.5
Red 65+ 19.6+
NOTE
The “Vibration” setting is only available on the Peregrine. Other models are visual
alerts only.
!

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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v81 Release Notes
VERSION 78 2020-07-23
NOTE
Will show “unavailable” until a dive is completed.
!
CHANGE
CHANGE
CHANGE
Removed the “Max Depth” setting from Adv Config 1. This setting acted as an
override to limit MOD to the specified depth even when PPO2 allowed that depth to
be exceeded. Now MOD is purely a function of PPO2. The new “Depth Alert” feature
can be used if you would like an adjustable depth based alert.
Renamed the “Dive Planner” to “Deco Planner”
Fixed temperature plot in dive log when log rate is not 10 seconds.
(OC Rec
mode only)
(all models)
(all models)
FIX
(alI models)
Factory test dives now labelled “factory” and do not count to dive totals.

2021-07-21
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Shearwater Petrel 2/Perdix/Perdix AI/NERD 2/
Peregrine Firmware v81 Release Notes
VERSION 72 2020-01-17
NOTE
A note on models: The NERD 2, Petrel, Petrel 2, Perdix, and Perdix AI share a com-
mon firmware base. Due to hardware differences, not all features are available on all
models. The following changes apply to all models unless otherwise noted.
!
CHANGE This release was installed on new production. No functional changes, just support
for minor production changes. It is not necessary for existing users to update to this
firmware version.
(all models)
VERSION 73 TO 77 2020-09-08
NOTE
Versions 73 to 77 were not publicly released.
!

2021-07-21
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Shearwater Petrel 1 & 2/Perdix/Perdix AI/NERD 2
Firmware v71 Release Notes
VERSION 71 2019-09-10
NOTE
A note on models: The NERD 2, Petrel, Petrel 2, Perdix, and Perdix AI share a com-
mon firmware base. Due to hardware differences, not all features are available on all
models. The following changes apply to all models unless otherwise noted.
!
CHANGE Changed how open circuit (OC) MOD PPO2 and Deco PPO2 limit settings are
applied. These limits determine the MOD of a gas, the PPO2 warning levels, and the
deco profile gas switch depths.
Rules for which PPO2 limit is used:
1. The enabled gas with the lowest O2 always uses the MOD PPO2 limit.
2. Gases above 40% O2 only use the Deco PPO2 limit (i.e. they are assumed to be
deco gases), except if 1) applies.
3. Gases 40% and below use the MOD PPO2 until deco stops are needed, at which
time they use the Deco PPO2 limit, except if 1) applies.
4. For “High PPO2” warnings, a 0.04 ATA buffer is used. For example, if the Deco
PPO2 is applicable and is set to 1.61 then:
• Above 1.57 = PPO2 displayed in yellow (but no warning).
• 1.65 or higher = PPO2 displayed in red and High PPO2 warning.
• This buffer does not apply to MOD depth calculations.
• This buffer does not apply to closed circuit (CC) PPO2 warnings.
(OC modes)
FIX
(AI models)
Fixed issue with incorrect display of SAC values in dive log.
IMPROVE Improved font smoothing at edges of grayed-out text.
(all models)

2021-07-21
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Shearwater Petrel 1 & 2/Perdix/Perdix AI/NERD 2
Firmware v71 Release Notes
VERSION 71 2019-09-10
IMPROVE
IMPROVE
IMPROVE
IMPROVE
O2 and diluent tank pressures now logged at each dive sample. Same format as
wireless AI tank pressure monitoring.
Scrubber stack timer values saved in log opening and closing records.
The deco planner results show rows in red when the PPO2 is out of range.
When the mini-compass is on the main screen AND the large compass has been
viewed for more than 10 seconds, marking the compass now goes back to the large
compass. Previously, it would go back to the main screen (i.e. remove the large
compass) because it assumed the mini-compass was being used. There is no change
for when the mini-compass is not being used, where it returns to the compass after
marking.
OC Minimum PPO2 setting default changed to 0.18 ATA from 0.19 ATA.
Added pink as colour choice for titles font.
The ascent rate indicator no longer shows the grayed-out arrows. These did not
add much additional information, and under some viewing conditions it was hard to
distinguish the active from grayed-out arrows.
The millivolts display does not time-out back to the main screen (i.e. it will remain on
the screen until a button press).
(X-CCR only)
(CCR modes
only)
(all models)
(models with
compass)
CHANGE
CHANGE
CHANGE
CHANGE
(All models)
(All models)
(All models)
models with
external
PPO2
monitoring
FIX
(AI models)
In menu “Dive Setup->NDL Display” fixed issue where the option “S.GF” (Surface
GF) appeared twice, but one of these was actually “GF99”.

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Shearwater Petrel 1 & 2/Perdix/Perdix AI/NERD 2
Firmware v71 Release Notes
VERSION 71 2019-09-10
FIX
FIX
(all models)
(all models)
Fixed issue in OC Rec mode when the safety stop “Count Up” option was being
used, where the count-up time was being added to the TTS. This issue did not affect
other modes (OC Tec or CC/BO).
Fixed issue where log file would report incorrect surface interval for surface intervals
greater than 45 days.

2021-07-21
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Shearwater Petrel 1 & 2/Perdix/Perdix AI/NERD 2
Firmware v65 Release Notes
VERSION 65 2019-01-18
NOTE
A note on models: The NERD 2, Petrel, Petrel 2, Perdix, and Perdix AI share a com-
mon firmware base. Due to hardware differences, not all features are available on all
models. The following changes apply to all models unless otherwise noted.
!
NEW
NEW
Surface GF display added. This shows the gradient
factor if you were to surface immediately. This is
different from GF99, which shows your gradient
factor at the current depth. Is available:
• On the standard info screens (i.e. after a few right
button presses).
• Can be configured on open main screen locations.
• Can be configured as the NDL replacement
(appears in-place of NDL once deco is needed)
Log sampling rate can be set to 2, 5, or 10 seconds
(previously always 10 seconds). Note that log
downloads may take longer with faster sampling
rates as more data is being recorded. Also, less
logs can be stored until they are overwritten. For
example, about 1000 hours are stored at a 10
second rate, but only 200 hours at a 2 second rate.
NOTE: When downloading to legacy log software
(e.g. old Shearwater Desktop or third-party
programs) the dive computer will down convert the
log to a 10 second rate for backwards compatibility.
Downloading at faster rates requires using
Shearwater Cloud v2.2.2 or higher. Third-parties
may offer download and display of the faster rates
in the future.
Surface GF is the gradient
factor if you were to instantly
ascend to the surface
Log Rate can be set to 2, 5, or
10 seconds
(All
Models)
(All
Models)

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Shearwater Petrel 1 & 2/Perdix/Perdix AI/NERD 2
Firmware v65 Release Notes
VERSION 65 2019-01-18
IMPROVE
IMPROVE
Allows user to set customized gradient factors
in OC Rec mode. Previously only fixed sets were
available in OC Rec mode.
Allows user to select a 20ft/6m last stop depth in
OC Rec mode. Previously the last stop was always
10ft/3m in OC Rec mode.
(OC Rec
mode only)
(OC Rec
mode only)
New OC Rec Deco Options
The “Clear Counter” counts
up once deco is clear
NEW A “Deco Clear” up-counter option has been added.
Available in OC Tec, CC/BO, and OC Rec modes. In
OC Rec mode it is available in place of the safety
stop. Optional in Tec modes.
When deco clears this counter begins counting up
from 0. It is useful for timing additional padding
after the mandatory decompression stops. If the
dive did not need deco, then begins upon entering
the safety stop zone (i.e. shallower than 20ft / 6m).
(All
Models)

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Shearwater Petrel 1 & 2/Perdix/Perdix AI/NERD 2
Firmware v65 Release Notes
VERSION 65 2019-01-18
CHANGE The PPO2 limit options have been changed for OC
Tec mode.
Previously, there was an “OC Max PPO2” setting
which only defined when the “High PPO2”
message occurred, regardless of dive phase (e.g.
bottom depth or at deco stop). This confused
many users who, quite reasonably, assumed it was
the “bottom depth” limit and set it to 1.40. This
would result in warnings during deco when the
PPO2 was pushed to the 1.60 range.
The “OC Max PPO2” has now been removed and
replaced with a “OC MOD PPO2” setting. The MOD
setting only applies to the bottom depth phase.
The dive computer automatically switches to using
the “OC Deco PPO2” limit when within 2 stops of
the next deco stop. The “OC Deco PPO2” limit also
sets where predictive deco gas switches occur.
Also, if the current gas has greater than or equal to
80% oxygen fraction, then the deco limit is used,
as the gas is assumed to be a deco gas.
After updating, the “OC MOD PPO2” value is set to
1.40 ATA and the “OC Deco PPO2” is unchanged.
Defaults are:
OC MOD PPO2 = 1.40 [ATA]
OC Deco PPO2 = 1.61 [ATA]
The new behaviour matches that of the Teric.
In semi-closed (SC) mode, only the “OC Deco
PPO2” limit is used for high PPO2 warnings.
(All models)
The “OC MOD PPO2” replaces
“OC Max PPO2” with different
behaviour. Please read the
description to left!