TRKR with Safe Voice Check

Track your team safely at a disaster site with voice checkin for safety


Our inspiration is a little stupid, but the movie Aliens, where the Marine leader is monitoring his team as they explore the disaster site.

Yes, you could stay on the line/phone the entire time, but that is inconvenient and may pose more hazard to the team in the field. And there may not be reliable G3 or Internet available. There are personal GPS devices that can do a subset of our management, but they cost a lot and may not be available on site. And they do not let a team leader manage an entire distributed team.

What it does

Our idea is a team tracking app (TRKR) that would allow team members to load a small app on their smartphones and then be tracked by their team leader via a web app (on a map). The smartphone app would be native, run in the background and ping the server every N minutes with location data (very low network bandwidth needed). The smartphone app could also detect movement (with the accelerometer) and ping new location data while on the move. This should allow for very low battery usage and minimal usage of GPS calls. TRKR will also periodically "ping" the user "Are you safe?" and require the user to use the Safe Voice Check (using the Knurld API).

On the web app side, the team leader could track all of their human assets, as a group or individually, and see their tracks over time. It would allow them to monitor team location in the field for security or medical reasons, signal to them (using a store and forward approach), and receive status updates from the field.

How we built it

TRKR consists of a few distributed elements:

  • A centralized API Service, written in Java and using MongDB for data storage.
  • A Web Application, for account management, monitoring and endpoint updates.
  • And multiple mobile app "pingers", that send heartbeats with location and status from each team member's smartphone.
  • These mobile apps also periodically request a safety check which requires vocal verification.

Challenges we ran into

The "pingers" could be native apps (and could run in the background) or could be hybrid apps (mostly JavaScript) and run as a foreground app.

Accomplishments that we are proud of

We got the REST API (with Java and MongoDB) working and got part of the web app (angularjs) working.

The web site is here

We got the mobile app working with the API and the Knurld API for Voice Check

  • The Ionic View app ID is: 280451c9

  • The Android APK can be found here

A full API GUI (in swagger) can be found here

What we learned

What's next for TRKR with Safe Voice

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