The Tern TX is the air-integrated, compass-equipped version of Shearwater’s compact round-faced Tern, aimed at recreational divers who want Shearwater’s ecosystem in a smaller, watch-style case than the Petrel or Perdix.
Shearwater Research
Shearwater Tern TX
A round, watch-style Shearwater with wireless air integration and a compass.
Open BLE sync (libdivecomputer)
Syncs wirelessly with third-party apps (Subsurface, Currents, etc.), not just the manufacturer app.
| Released | 2023 |
| Max depth rating | 120m |
| Algorithm | Bühlmann ZHL-16C with gradient factors |
| Air integration | wireless |
| Wireless | bluetooth |
| Display | 1.3" AMOLED |
| Battery | rechargeable |
| Digital compass | Yes |
| Gas types | air, nitrox |
| Gas switches | 4 |
| CCR capable | No |
"Gas switches" is how many different mixes this computer can be programmed to switch between mid-dive, mostly relevant for technical/staged-decompression diving. It doesn't tell you which gas types (air, nitrox, trimix) are supported. See Gas types and the product description above for that.