I'm looking for a GPS tracking device - something that can be placed inside the holdall of some shared equipment so its location can always be determined. Ideally there'd be an app that shows the item location on a map (like Apple's "find my iphone").

I've tried the GeGo Luggage Tracker (https://www.amazon.co.uk/GEGO-Lugloc.../dp/B07F47YCYS) and while it held charge well (easily several days), was a good size, and the app did what I wanted, unfortunately the GPS tracking part was not great, with no signal when inside some frequently used buildings. A phone in the same locations *can* be detected.

Has anyone done something similar and can recommend an alternative device?