Garmin Descent T2 Transceiver SubWave sonar for dive computers — black, SubWave™ wireless sharing & 20 ATM-rated

The Garmin Descent T2 Transceiver is a compact SubWave™ sonar accessory that wirelessly shares tank pressure, consumption and short diver-to-diver messages with compatible Descent air-integrated computers.

Designed to snap to a high-pressure regulator port, the Descent T2 extends situational awareness below the surface by sending real-time tank and buddy data to compatible Garmin Descent dive computers (sold separately). It combines SubWave™ short-range sonar networking with BLE pairing for simple setup, a user-replaceable CR123A battery rated for long dives, and a 20 ATM dive rating for demanding conditions. Software v.15.70 or later adds message exchange and improved network features.

How does the Descent T2 share my tank information during a dive?

The T2 reads high-pressure port data and transmits tank pressure, consumption rate and estimated time remaining to a paired Descent air-integrated computer. That computer displays the values on your wrist so you see tank status without looking at the regulator.

• Sends real-time tank pressure and air time remaining to compatible Descent units.
• Calculates air consumption rate for accurate remaining-air estimates.
• Supports monitoring of up to 8 transceivers per computer for multi-tank or multi-buddy setups.
• Works with SubWave-enabled Descent models running software v.15.70 or later.

Can I communicate with my dive buddies using this transceiver?

Yes — the T2 enables exchange of preformatted diver-to-diver messages through the SubWave network when paired with compatible air-integrated Descent dive computers. Message range reaches roughly 30 meters in ideal conditions, helping keep teams coordinated underwater.

• Send and receive short, preset messages between networked Descent devices.
• Effective messaging range up to about 30 meters, depending on conditions.
• Buddies’ names are shown after simplified BLE-based pairing for fast identification.
• Messages require compatible Descent models and software v.15.70 or newer.

How rugged is the T2 and what is its battery life?

The transceiver is built to dive-rated standards (20 ATM) so it tolerates deep-water use, and it uses a CR123A lithium battery that you can replace in the field. Garmin estimates up to 100 hours of dive time per battery under typical conditions, letting you rely on it across multi-day trips.

• 20 ATM dive rating suitable for deep recreational and technical diving.
• User-replaceable CR123A battery with up to ~100 hours of operation.
• Compact form that attaches to high-pressure regulator ports without hose interference.
• Seals and materials designed to resist saltwater and pressure exposure.

What do I need to use the Descent T2 with my gear?

To take full advantage of the T2 you need a compatible air-integrated Garmin Descent dive computer (sold separately) and the required software version. Pairing uses Bluetooth Low Energy for initial ID and SubWave for underwater networking; ensure your dive computer’s firmware is current for messaging and multi-transceiver support.

• Requires a compatible air-integrated Descent series dive computer (sold separately).
• Firmware/software at or above v.15.70 unlocks buddy messaging features.
• Attach to the high-pressure port on the regulator—no hose rerouting needed.
• Pairing via BLE then communicate underwater over SubWave sonar network.

Who this is for: The Garmin Descent T2 Transceiver suits divers who want clearer air awareness and team coordination without adding bulky hardware to the regulator. It’s ideal for tech and recreational divers who use Garmin Descent air-integrated computers, dive teams that monitor multiple tanks or buddies, and anyone who values straightforward setup, long battery life and a rugged, dive-rated accessory to improve underwater situational awareness.