I’ve used then when I was working with the prison on the K-9 team. They had great reception anywhere we took them. We tracked folks for the sheriffs, pd, and game fish and never had a single issue. If you key up to talk it would update your coordinates on your partners radio if you have it enabled to do so. Out in the swamps along the gulf where the canopy is super thick and no cell service what so ever, they talked and tracked flawlessly. We used Garmin map cards in them with Birdseye view. That was a few years ago so I’m sure the newer ones would have to be as good if not better.