The Shearwater Research NERD 2 DiveCAN is a heads up (HUD) dive computer. The Near Eye Remote Display (NERD) incorporates a powerful feature set, easy to understand menus, easy to read full-colour display, and a special optics and mounting system that projects the equivalent of the Shearwater dive computer as a heads up display directly in the eye of the diver. This model incorporates a connector to support CAN bus technology for integration into JJ, O2ptima and Prism2 rebreathers.
The Shearwater NERD 2 is a full decompression dive computer incorporating the functionality of the Shearwater Research Perdix AI, but with a display mounted on the diver's rebreather mouthpiece. Recent models of the JJ-CCR, Dive Rite O2ptima, Hollis Prism 2, and iQsub X-CCR rebreathers use a Shearwater electronics package incorporating CAN-bus technology. The standard LED HUD that comes with the electronics can be upgraded to a full Shearwater NERD 2 dive computer HUD by unplugging the LED HUD and plugging in the NERD. Each of the CAN bus NERD 2 interfaces is specific for a particular brand rebreather, so you will need to select appropriately.
This revolutionary device keeps crucial information in your line-of-sight for the entire dive. Thanks to the Micro LCD display and magnifying lens, the data appears as if displayed on a 32" TV screen 12" away, with no need to focus. If you can watch a TV without glasses, and even if you have a bifocal lens mask for reading gauges, you should have no problem seeing the NERD 2. The display is unobtrusive as it virtually disappears when you look straight ahead. The numbers are there when you need them at any point during the dive, and out of the way when you don't. The full-colour display is used to convey additional meaning with the information being displayed. When information is yellow or red, it calls the diver's attention to an unusual value or problem.
During a decompression dive, the Shearwater NERD 2 provides complete information displays of all required stop times. The NERD 2 can provide time-to-surface based on "look ahead" at planned gas switches. Multiple gas definition presets are supported with any combination of oxygen, nitrogen and helium.
The Shearwater NERD 2 will NOT "lockout" after a missed stop or ascent rate violation.
Out of the box, the Shearwater NERD 2 includes open-circuit and closed-circuit Air, Nitrox and Trimix mixed gas functionality along with several enhanced navigation features for the three-axis tilt-compensated digital compass. The standard firmware supports English language menus and both imperial/metric units of measure.
The Shearwater NERD 2 is capable of wirelessly connecting to either one or two optional transmitters giving the diver ability to monitor up to two tank pressures. Air integration is optional for all modes, from OC Rec to CC/BO. The tank pressure(s), in PSI or BAR, and GTR can be displayed to the customisable slots on the main display screen or accessed through the underlying information screens. Enabling the AI feature causes approximately 10% decrease in battery life.
After the dive, the Shearwater NERD 2 communicates via next-generation Bluetooth Smart Ready with iOS devices such as the iPad and iPhone. In addition to current Shearwater and third party support for Mac and PC desktop applications, users are able to download dives using their iOS devices in conjunction with third-party applications. The NERD 2 incorporates a built-in lithium-ion rechargeable battery. Users can expect a minimum of 18 dive hours, on medium brightness, from a fully charged NERD 2 and 5 charges from the charge bank.
Included with every Shearwater NERD2 DiveCAN from The Scuba Doctor are a universal mounting clamp, recharging clip, charging bank, USB cable, CanBUS connector (plug compatible with the other Shearwater CanBUS devices), and printed Quick Start Guide with instructions for downloading software from the Shearwater Research website. The software includes a complete dive log manager, compatible with both MS Windows and MAC OS X. The dive log manager supports log downloads and firmware updates via the Bluetooth wireless interface. An optional VPM-B unlock code enables using the Varying Permeability Model (VPM-B and VPM-B/GFS) algorithm for calculating decompression.
Shearwater Research NERD 2 DiveCAN Features
Technical dive computer with a "Heads Up Display"
Crucial data in your line-of-sight for the entire dive
Full colour display with magnifying lens is easy to read
Air, Nitrox and Trimix mixed gas for OC or CCR
Feature rich with the latest diving technology
DiveCAN connector for JJ-CCR, Dive Rite O2ptima, Hollis Prism 2, and iQsub X-CCR rebreathers (please specify)
Shearwater Research NERD 2 DiveCAN Technical Features
Depth, time and oxygen
Bühlmann decompression model with gradient factors conservatism
Optional VPM-B decompression model
Imperial and metric displays
NERD 2 available in Standalone,
Fischer and DiveCAN models Any combination of oxygen, nitrogen, and helium (Air, Nitrox, Trimix)
Open and closed circuit, switchable during a dive
External (EXT) PPO2 monitoring from 1, 2 or 3 cells
Internal PPO2 mode with 2 set-points
Automatic PPO2 set-point switching (configurable)
5 CC and 5 OC gases
Gases can be changed and added during a dive CNS tracking
No lockout from violating deco stops
Rechargeable lithium-ion battery providing up to 18 hours of dive time
Tilt compensated digital compass
1000 hour dive log memory
Log downloads and firmware upgrades using Bluetooth
A menu system that adapts to diving status
Dual-transmitter Air integration
Auto turn-off after 15 minutes on the surface
Depth sensor rated to 140 msw (450 fsw)
Multiple Diving Modes
Three gas nitrox computer with features for the serious recreational diving enthusiast. Includes adaptive safety stop and NDL bar graph.
5 OC gases Trimix enabled by default.
Closed Circuit/Bailout, 5 OC/5 CC gases, Trimix enabled, Constant PO2 for closed circuit.
Real-time PPO2 monitoring of 1 to 3 O2 sensors. This includes semi-closed rebreathers.
Optional 3 axis, tilt compensated, digital compass. Available in all modes.
Depth, time, resettable stopwatch function. Full dive logging. Shearwater Research NERD 2 DiveCAN Technical Specs
3 gas nitrox recreational computer
Multi gas, trimix decompression computer
Closed circuit fixed PPO2
(Fischer only) Closed circuit real time monitoring of 1 or 3 O2 sensors
(Fischer only) Semi-closed monitoring of PPO2 for 1-3 O2 sensors
Bottom timer with stop watch and dive logging
Nerd 2 SA
Nerd 2 Fischer
Trimix / Nitrox / Air Compatible
Bühlmann Gradient Factors
Closed Circuit Fixed PPO2
Closed Circuit External PPO2
Semi-Closed Circuit External PPO2
3 axis, tilt compensated digital compass
Number of Transmitters
1 or 2
1 or 2
Optional Add-Ons & Accessories
OC Mount Kits
CC Mount Kits
Nerd 2 SA
Nerd 2 Fischer
Rechargeable Li-Ion Battery
18 Hours (Medium Brightness)
5 Years (or 500 charge cycles)
Number of Gases
5 OC / 5 CC
Fischer 103, 7-pin
33mm x 85.81mm x 44mm
Ballistic Nylon Case
240mm x 240mm x 60mm
NERD 2 Rebreather Mount
NERD 2 Open Circuit Mount In the Box
CCR/SCR Mounting Kit
USB Charging Cable
Please Note: We try to keep Shearwater Research products in stock. As we source them direct from Shearwater Research in Canada, it can take 7 to 14 days for more stock to arrive if we run out.
This product has a limited warranty of two (2) years.
Please download/read the
Shearwater Research Nerd 2 Brochure (PDF, 2 pages, 1 Mb).
Please download/read the
Shearwater Research Nerd 2 Operating Instructions Manual (PDF, 117 pages, 11 Mb). This manual provides operating instructions for the following NERD 2 Models:
Stand Alone Model (SA)
Fischer Connector Model
DiveCAN Rebreather Controller
DiveCAN Rebreather Monitor
Note: This item cannot be delivered outside of Australia.