Anyone used any GPS trackers. Standalone units I'm talking about.
Basically we have some non-powered items we use for transporting steel - occasionally (seemingly increasingly) these are going missing and at a few hundred $ ea in material and fabrication time its wearing thing.
So we're looking for a way to track their location using GPS technology if possible - something self contained with no external power source required and with a long (1 month +) battery life.
Does anyone know of such devices?