An Open Source Project
A tough, water resistant survey device built for modern caving. Connects to survey apps TopoDroid & SexyTopo. Fully repairable. Fully yours.
Built on the open-source SAP6 platform
The Device
Sealed, rugged, and repairable — the DiscoX is a precision cave survey instrument that goes where your survey takes you.
Built for Cavers
Designed from the ground up for wet, muddy, and unforgiving cave environments — with repairability and simplicity at its core.
Every component can be made, sourced, salvaged, 3D printed, or laser cut. No proprietary lock-in — just fix it and get back to surveying.
Connects wirelessly to TopoDroid and SexyTopo. Take readings and send them straight to your phone — zero paper, fewer errors.
An intuitive calibration algorithm runs entirely on the device — no second device needed.
Readings are automatically checked for magnetic interference from helmet lights, watches, or bolts. Get alerted before bad data enters your survey.
A colour-coded LED band shows device state at a glance — red for stabilising, green for reading taken, purple for leg detected. Plus a dedicated disco button.
Long range Bluetooth delivers over 20m line of sight range, keeping you connected at a distance.
A resin-capped USB-C port isolates internals while providing easy access for charging and programming settings.
A dedicated battery monitoring chip gives you accurate charge levels.
Scratch-resistant Gorilla Glass display cover and quartz glass laser protector handle the scrapes and bumps of cave life.
Technical Specifications
A breakdown of the sensor modules and components that make the DiscoX a reliable cave survey instrument.
| Range | Up to 100 m (ideal conditions) |
| Connectivity | Bluetooth — TopoDroid V6 & SexyTopo |
| Interface | 4 membrane buttons, 128×128 px screen |
| Display Cover | Gorilla Glass |
| Laser Cover | Quartz Glass |
| Processor | M4 microcontroller |
| Battery | 1200 mAh · ~125 mA average draw |
| Charging | USB-C (resin-sealed port) |
| Case | Polycarbonate + PETG, internal epoxy coating |
| Water Resistance | Sealed design — theoretically waterproof but not guaranteed for submersion |
| Status Indicator | RGB LED band |
| Software | C++ (see codebase) |
| Repairability | Fully modular — 3D printable, laser cuttable & all parts available |
| Price | £450 |
Get in Touch
Whether you're interested in ordering, need spare parts, or have more queries — drop me a line.