Una GPS smart watch – Repairable, USB-C charging, developer-friendly

Original Article ↗ Hacker News Discussion ↗

A new modular GPS sports watch, Una, aims to stand out with USB‑C charging, repairable hardware, and a developer SDK as an alternative to closed ecosystems from Garmin and Apple. Commenters welcome the promise of data access and avoidable proprietary cables, but see major drawbacks in its limited IPX5 water resistance, immature software and sensor algorithms, and loosely used “open source” branding. Many view it as an interesting first-generation product for tinkerers rather than a viable replacement for established, highly durable fitness watches with long battery life and rich training features.

Water resistance & durability

  • IPX5 and “non‑submersible” status is widely seen as a deal‑breaker for a sports/GPS watch.
  • Many expect at least IP68 / dive‑watch‑level resistance for swimming, rain, mud, showers, and general abuse.
  • Several anecdotes about devices with similar ratings failing after repeated rain or water exposure; marketing the watch as “lifetime” but only splashproof is viewed as inconsistent.
  • Confusion/annoyance that the USB‑C cable is advertised as IP68 while the watch is only IPX5; some call this borderline deceptive.

Charging, ports & form factor

  • USB‑C is praised for eliminating proprietary cables and enabling direct data access, especially versus Garmin’s finicky connectors.
  • Others argue USB‑C is bulky, hard to waterproof, and more failure‑prone with dirt/sand; magnet/pogo-pin or wireless charging is preferred.
  • Suggestions for future versions: better port door, optional wireless charging, and improved sealing.
  • Some dislike large, round smartwatches generally; others note Una is smaller/lighter than many Garmins.

Battery life & hardware

  • Battery life is a key concern; Una’s real‑world endurance is unclear in the thread.
  • Competing watches (especially Garmin and Coros) are praised for multi‑week battery life and extreme durability, including ocean dives and harsh sports.

Software, sensors & fitness quality

  • Lack of reviews and performance data (HR accuracy, GPS quality, training algorithms) makes many suspect the watch may be immature as a serious fitness tracker.
  • Commenters note that getting good optical HR and algorithms took major brands multiple generations.

Openness, data access & privacy

  • Strong interest in open APIs and the ability to pull data into self‑hosted systems without cloud lock‑in.
  • Some are unsure how “open” Una really is: SDK and FreeRTOS are mentioned, but full firmware/source and data‑export story remain unclear.
  • Desire for a watch that works without mandatory accounts/apps and minimizes “surveillance capitalism.”

Repairability, parts & value

  • Repairable design and user‑replaceable battery are praised in principle.
  • Concern that spare parts (screen, battery) are “coming soon” rather than available now, undermining the repairability pitch.
  • Price (~€240) seen as attractive compared with high‑end Garmins, but many conclude current IP rating and ecosystem gaps make it hard to switch yet.