Stealth-O can be as light or as deep as you want. The easiest way in is downloading the app and mapping a place near home, just to see what the relief looks like.
Walk an area with an iPhone and collect relief points. You can map your own patch, improve an existing place, or gather data for someone else's map. The result can be rendered as relief, used for Stealth-O routes, or exported as X Y Z for OCAD-style map work.
The app can work as a race official's tool. Start a participant, read the session from their wristband when they finish, and upload the result. The route is prepared separately; the app handles the field side of the run.
If you want to build a full course, there are tools for turning checkpoints and relief data into a map and PDF. Pick an area, set checkpoints, draw a route, and make something people can run.
The stations and wristbands are DIY hardware. The components are off-the-shelf, roughly under EUR 10 per unit in batches of a few dozen. You source the parts; the official prebuilt firmware is available on GitHub. No kit sales.
Interested? Write to iuliia.apps@gmail.com