# SeshTimer for Underwater Rugby (UWR)

> SeshTimer for Underwater Rugby is a tablet stopwatch and apnea interval timer built specifically for underwater rugby clubs, national squad trainers, and CMAS teams. It tracks paired bench rotations (Wechselpaare), 15s bottom holds on the rim, and sub-surface fin sprints in 3.5m–5.0m diving pools. It runs 100% offline in concrete basement pools.

- Website: https://uwr.seshtimer.app/
- Web app (login / get started): https://go.seshtimer.app
- Languages: English, German (Deutsch), Spanish (Español)
- Creator: ATN (https://www.atn.hu)
- Sport: Underwater rugby (Unterwasserrugby, Rugby subacuático) / CMAS

## Key facts

- Diving pool depth: stores exact horizontal length and vertical bottom depth (e.g. 20m length with 4.5m depth).
- Rotation pairs & wave mode: sends off paired defenders or wingers simultaneously with 1 tap on "Start wave" while earlier pairs are still underwater.
- Touchscreen resilience: large 56px–68px buttons with tap debouncing; water splashes and dripping hands do not cause false splits.
- Independent undo: undo mistakes on a single player card without pausing or resetting any other teammate.
- 100% offline natatorium sync: queued in local IndexedDB storage; never loses splits when cell signal drops in basement pools.
- Analytics: leaderboards, target cutoff comparison (e.g. 16.00s basket touch benchmark), public read-only athlete links, and Excel export.
- Safety notice: SeshTimer is a timing tool, not a lifeguarding or sub-surface safety supervision system.