I guess we would just set up a cow fence.

These GPS trackers help find cattle, possibly making rescue efforts faster and thus cheaper, but they do not prevent them falling into that river in the first place. A fence does.

I know, this is the classical "NASA builds a 1 million dollar Space pen, Russians use pencil" story - but sometimes, high tech is not necessary to solve problems that have been solved for centuries.

Doesn't mean we don't need better infrastructure. Just that we should avoid overcomplicating things.