Dive Computers
Shearwater Tern TX
Manufacturer Shearwater
The Tern TX from Shearwater Research of Canada is an Advanced Nitrox dive computer with easy-to-understand menus. The Tern offers a large 3.3 cm easy-to-read display utilizing a AMOLED 360 x 360 color screen. The Tern includes open-circuit dive modes for Air, single gas Nitrox (up to 40%), and user selectable 3-gas Advanced Nitrox (up to 100% O2), as well as a richly featured gauge mode. The Tern TX adds support for a digital compass and cylinder gas pressure integration, sometimes called air integration (AI), with up to four (4) separately purchased optional SWIFT wireless transmitters.
The Tern has been designed with a wireless rechargeable battery and includes a wireless induction charging pad. Typical dive time on a single charge is 20 hours at medium screen brightness. Although Shearwater recommends using their specific charging pad, the Tern can also be charged by the flat mats that support the Qi wireless-charging standard (which includes the latest iPhones and many Android phones).
Feature Highlights
- Air/Nitrox capable up to 100% O2
- 3 open-circuit gas switch presets
- Bühlmann ZHL-16C algorithm with configurable Gradient Factors
- GF presets for sport diving NDL safety factor: High = 35/75, Medium = 40/85, Low = 45/95, plus user defined GF
- Multi-compartment tissue saturation bar graphs
- %CNS oxygen exposure tracking
- No decompression limit (NDL) sport dive planner
- Ascent rate monitor
- Haptic (vibration) alarm that can be disabled
- Date, time and temp display
- Easy two-button ergonomic operation adaptive menus with support for ten languages
- Extensive "home screen" customization options
- User configurable units: imperial (feet) or metric (meters)
- Logbook of last 500 hours of diving
- Battery charge level and warning
- TX model supports digital compass and optional wireless tank pressure transmitters
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