I've been playing with some very expensive/accurate (down to single-ns-level) GPS receivers lately.

But I wanted to see how a cheap ($10) USB receiver would fare... and it's easy enough to just connect to it from my Mac! Blog post with the details: https://www.jeffgeerling.com/blog/2025/trying-out-cheap-usb-vk-172-gps-dongle-on-mac