Not in Scotland but it was patchy/delayed in Somerset. At best it would give you a rough location to search in. I wouldn't trust it 100% but a Garmin equivalent is a lot of money!
We had a Tractive for our dog who loves fucking off in the woods.
Useless.
Often dropped signal, slow to give you a location, location was vague. We gave up and bought falconry bells so we can hear him running about.
Have used https://tractive.com/ before but quickly realised our Whippet is stuck to us like glue so we are a lot more relaxed now.