Black Water TekBuhlmann ZHL-16C · OC + CCR
Plan deeper. Surface safer.
Two tools for the serious diver. A fast gas calculator in your pocket, and a full multi-gas decompression planner for open and closed circuit, on the same verified Buhlmann engine your Shearwater runs.
The products
Two apps, one engine.
Both products share the same Buhlmann ZHL-16C core, so the numbers agree from the surface check to the full deco plan.
Live on iOS + Android
DTS Gas Guru
The everyday gas calculator. MOD, best mix, equivalent narcotic depth and blending, fast, offline, in eight languages.
- MOD, EAD, END and gas density at depth
- Best mix for a target depth and narcotic limit
- Nitrox and trimix blending with real-gas Z-factors
- Eight languages, works fully offline
Technical planner
DTS v3.0 Dive To Survive
The full decompression planner. Open and closed circuit, multi-level, stage cylinders, team sign-off and a complete dive log.
- Buhlmann ZHL-16C, 16 compartments, gradient factors
- Open circuit and closed-circuit rebreather with bailout
- Multi-level profiles, altitude, repetitive dives
- Stage cylinders, tissue compartment graph, Shearwater import
What it does
Everything a tec dive needs.
Real planning features, not a toy. Each one runs from a single shared engine so the whole app stays consistent.
OC + CCR planning
Open circuit and closed circuit with a full setpoint model (descent, per-level bottom, deco) and worst-case OC bailout schedules.
Gradient factors
GF Low and GF High control first-stop depth and surfacing conservatism, your call.
Stage cylinders
Per-diver stage and bailout cylinders, selectable per dive, with real cylinder volumes in the gas plan.
Tissue compartments
The full 16-compartment ZHL-16C loading graph, nitrogen and helium, with the controlling compartment.
Multi-level profiles
Stack depth and time levels with per-level gas; tissue loading is carried continuously.
CNS and OTU
Oxygen exposure tracked through the dive and decayed across surface intervals for repetitive dives.
Gas density limits
DAN and NEDU density caution and critical limits flagged at planned depth.
Shearwater import
Pull dives straight off a Perdix over Bluetooth: depth, ppO2, temperature, deco and gas.
Team + instructor sign-off
Every diver verifies and approves the plan; the instructor gives final sign-off. Per-diver certifications with dive prerequisites.
Gas blending + cost
Partial-pressure blending with cylinder library and per-litre blend cost.
Altitude
ICAO standard-atmosphere correction; ceilings, NDL and schedules adjust automatically.
Full dive log
Save, import and export dives with profile graphs and residual-exposure carryover.
The engine
Trustworthy numbers.
The decompression core is a pure, unit-tested Buhlmann implementation whose float runtime accumulation matches MultiDeco output exactly. The same maths that ran on the dive below.
Built by a technical diver
Will Goodman, Black Water Tek.
DTS is built by the diver who needs it to be right. Will is a TDI Advanced Trimix Instructor Trainer and Indonesia's factory-approved JJ-CCR service technician, with more than 7,000 logged dives.
- 290 m world record for the deepest dive on an unmodified CCR, 2014
- 4,000+ dives on closed-circuit rebreathers
- 3 x Guinness World Records for the longest saltwater scuba dive
- 20 years teaching technical diving from the Gili Islands
Pricing
Two products. Pick where you dive.
DTS Gas Guru is a standalone app you buy once on the stores. DTS v3.0 is the full planner: everything Gas Guru does, plus complete decompression planning, a dive log and team tools.
Gas Guru
- MOD, EAD, END and gas density
- Best mix for depth and narcotic limit
- Nitrox and trimix blending
- Eight languages, fully offline
DTS Pro
- Everything in Gas Guru, plus
- Full OC and CCR decompression planning
- Stage cylinders + tissue graph
- Multi-level, altitude, repetitive dives
- Dive log, Shearwater import and cloud sync
DTS Instructor
- Everything in DTS Pro, plus
- Team management
- Team plan sign-off and briefing
- Student plan review
Get the apps
Download DTS.
DTS Gas Guru is live on the App Store and Google Play. The DTS v3.0 planner runs on the web today, with native apps in build. Store and web links land here at launch.