Turnaround: an open‑source hiking buddy that knows when you should turn back, and tells someone if you don’t come home

说明与用途

Turnaround 是一个本地应用，预测徒步完成时间，提供语音提示，启动可靠计时器，并在徒步超时时自动通知联系人。

问题

Hikers often over‑estimate how long a trail will take and fail to notify trusted contacts if they don’t return on time.

结果

Turnaround delivers a personalized hike‑time estimate, an audible briefing, a crash‑resistant safety timer, and automatic emergency notifications, improving safety for solo hikers.

工作流

• 1. Enter trail distance, elevation gain and trailhead into the app. 2. Turnaround predicts a 90 % finish time, a "turn‑around by" time, and a "back‑by" time. 3. The app speaks a briefing using Gemma 4 and Kokoro. 4. The hiker taps "Start" to arm the safety timer. 5. The hiker checks in on the phone. 6. If the hiker misses the check‑in past the alert deadline, an email is sent to the emergency contact. 7. If the hiker checks in after the alert, a second email is sent confirming safety.

证据

I held out 1,438 hikes the model never saw and compared it with Naismith: Average error 44.1 min vs 34.8 min; Real times inside the predicted 90% band 89.5%

来源

The safety timer is a Temporal workflow. One tripWorkflow per hike races a check‑in signal against a durable timer set to the alert moment.

来源

If the hiker misses the check‑in while the mail server failed, activity retried; alert went out on attempt 2.

来源