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Heinrichs Weikamp OSTC 3

Quick Overview

Our OSTC3 is the perfect fit for technical divers that appreciate a compact OSTC without any compromises.

The compact and robust aluminium housing of the OSTC3 is suitable for depths up to 120 metres and incorporates a 3D compass. The OSTC3 is operated by the firmware hwOS which offers a wide range of configuration options and additional functions such as an apnea mode. The OSTC3 supports Trimix and allows to pre-set up to five gases for a given dive. Decompression stops are calculated using either the classic Bühlmann model or gradient factors. Rebreather divers may monitor their oxygen levels with an optical interface.

The high-contrast colour display can be read even by sunshine and in darkness. It is saved by a Perlucor® ceramic panel which is very solid and pressure-tight. Benefiting from a simple power concept the OSTC3 works with an easily replaceable AA battery. The internal logbook records up to 1000 hours of diving and is complemented by a variety of logbook software for all computer operating systems. The new OSTC 3 operates wirelessly: Logbook data and updates are transferred via Bluetooth.

Developed and produced entirely in Germany, the OSTC3 is backed by years of experience and continuous improvements. Last but not least, it comes with free firmware updates, an interactive user forum, rapid service and competent support.

Only 10 left

Availability: In stock

Regular Price: US$1,040.73

Special Price US$936.65



3D compass
3D compass with bearing.

LCD display
High resolution IPS LCD monitor with ambient light sensor. It is saved by a Perlucor® ceramic panel which is very solid and pressure-tight. A simple AA battery makes your OSTC3 work in dive mode for 50 hours, with a permanent illumination of the colour display.

Field of view: 160°
Resolution: 320 x 240 Pixel
Size: 2” (51 mm screen diagonal)

Digital optical link
The wet connector system can be connected to the hw HUD. So rebreather divers can use it for O2 monitoring.

With the integrated bungee mount you can use the advantages of the easy and robust bungees. Alternatively there is a bungee wristband available.

Technical data


Low power microchip PIC18F87K22

Data storage

4 megabyte Flash


High resolution IPS LCD Monitor with ambient light sensor
Field of view: 160°
Resolution: 320 x 240 Pixel Status display: 2 LEDs


Digital optical link (wet connector system)


Intersema MS5541C
Temperature: resolution 0.1 °C / ± 1 °C 3D compass (fully tilt-compensated)

Power supply

AA battery of any type
Up to 60 hours of operation, 2 years standby

Operating elements

Two push buttons


Milled from a single block of alloy Scratch resistant borosilicate-glass panel


64 mm x 62 mm x 22 mm


160 gr.

Operating depth

120 meters

PC software

Diving Log, JdiveLog, MacDive2 (UDDF), Subsurface, and others

Scope of delivery

OSTC3 diving computer Firmware by heinrichs weikamp Micro USB cable
Robust neoprene box
Screen protector

Accessories (optional)

Optical cable for hw HUD


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