A serious issue has been identified with Tern and Tern TX v34 firmware. A fix is coming Monday April 14th, but in the meantime, it is important to take a precautionary measure.
Shearwater Tern (left) and Tern TX
The issue is that if using Air mode and the Nitrox mode gas has been programmed to something other than air (21%), then that programmed gas is used while diving. This could result in a less conservative dive plan than is appropriate.
Prevention: If using firmware v34, do not use single gas Air Mode. Instead, use the single gas Nitrox Mode with 21% gas programmed.
Updated firmware for Tern and Tern TX will be released Monday April 14, 2025. Please check our website for the newest version.
This issue does not affect any other products and only affects the Tern and Tern TX in v34 firmware.
If you have any specific questions or concerns, please reach out to info@shearwater.com.
