This is where you will find links to download SubGravity CCR manuals, checklists, software and other cool SG CCR stuff. As we produce updated manuals and other documents for the rebreathers, we will post them here for download. Please check back often to ensure you have the latest version of the official CCR software, manuals and checklists.
CCR User Manuals
- SubGravity Defender CCR User Manual v1.1
- SubGravity SG-1 Electronics User Manual v2.10
- Shearwater Petrel / NERD User Manual and Firmware Updates
- X-CCR User Manual v2.2.3
- FX-CCR User Manual v2025.1
- FLEX2-CCR User Manual 2023_1.2
CCR Software/Firmware Updates
- SubGravity USB SG-1 Software Update v2.16
- Refer to Chapter 11 "SOFTWARE UPDATE" in the SG-1 User Manual for detailed instructions on updating your USB SG-1.
- SubGravity BT SG-1 Software Update v1.24
- Refer to our BT Update Instructions for detailed instructions on updating your Bluetooth SG-1.
- Shearwater Petrel 2 / NERD User Manual and Firmware Updates
CCR Forms & Waivers
When purchasing a new rebreather from SubGravity, or sending an older unit in for upgrades or repair, please download and complete the appropriate form from below.
CCR Checklists
Use the SubGravity CCR checklists every time you dive. We have created various versions which are intended to be used for differing purposes. If you have any questions about the checklists below, feel free to contact us at support@sub-gravity.com or speak with your factory approved SubGravity CCR instructor.
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iQsub X-CCR
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iQsub FX-CCR
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Calibration Kit
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NO Calibration Kit
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iQsub Flex 2 CCR
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Calibration Kit
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NO Calibration Kit
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SubGravity Defender CCR
