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
Rev A
Page 1
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)
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
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
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
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)
2021-07-21
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2021-07-21
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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
2021-07-21
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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.
!
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
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)
This manual suits for next models
3
Table of contents
Other Shearwater Diving Instrument manuals
Shearwater
Shearwater DiveCAN Petrel 1 User manual
Shearwater
Shearwater Perdix User manual
Shearwater
Shearwater Perdix 2 User manual
Shearwater
Shearwater Peregrine User manual
Shearwater
Shearwater Petrel Standalone User manual
Shearwater
Shearwater DCIEM User manual
Shearwater
Shearwater Perdix User manual
Shearwater
Shearwater Perdix Instruction Manual
Shearwater
Shearwater NERD 2 User manual
Shearwater
Shearwater Petrel 3 User manual
