Heinrichs Weikamp

Heinrichs Weikamp OSTC Sport

A stripped-down, AA-battery OSTC with magnetic buttons built for gloved recreational use.

Open BLE sync (libdivecomputer)

Syncs wirelessly with third-party apps (Subsurface, Currents, etc.), not just the manufacturer app.

Heinrichs Weikamp OSTC Sport
3.1Comparison Score
$490
Released2019
Max depth rating120m
AlgorithmBühlmann ZHL-16C with optional gradient factors
Air integrationnone
Wirelessbluetooth
DisplayColor LCD
Batteryuser-replaceable
Digital compassYes
Gas typesair, nitrox
Gas switches3
CCR capableNo

"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.

Pros
  • Standard AA battery, up to 150 hours of dive time with SAFT cells
  • Magnetic, user-maintainable buttons that work with thick gloves
  • Nitrox up to 100% O2 supported out of the box
Cons
  • No GPS, air integration, or wireless charging
  • Trimix and CCR require a paid online firmware upgrade (~€120)
  • Niche brand with a smaller dive-shop support network than the majors
Diver community sentiment
Mixed opinions

Divers on Scubaboard generally praise the OSTC Sport's build quality and battery life (AA cells reportedly lasting up to ~150 hours), its crisp/customizable display and intuitive menu logic, some rate the UI above Shearwater's Petrel/Perdix, and Heinrichs Weikamp's free-of-charge repair service even outside warranty. The missing built-in air integration is a recurring complaint across the OSTC line. Reliability is a genuine sore point for some: one long-time OSTC owner reported five hardware failures across two units before switching brands despite liking the company's service. Secondhand units appear to move slowly, suggesting a small, niche buyer base.

Scubaboard: OSTC Sport sale/discussion threadScubaboard: OSTC feedback and reliability threadScubaboard: general OSTC-line discussion

Summarized from public forum discussion (Scubaboard, Reddit, and similar), not a survey we ran ourselves. See the linked threads for the original conversations.

The OSTC Sport strips Heinrichs Weikamp’s open-source platform down to a simpler, AA-battery recreational computer with magnetic buttons, leaving trimix and CCR support as a paid unlock for divers who outgrow single-gas diving.