for Raspberry Pi GNSS L76X GPS HAT Supports Multi-GNSS Systems GPS BDS QZSS Supports DGPS SBAS Interface UART with External Antenna Industrial PDA Tracking Security System Module @XYGStudy

Good: this GPS HAT is easy to connect, and the GPS worked well! It acquired a signal quickly, even indoors. The obvious extras are included, like external antenna, uFL to SMA adapter, and mounting standoffs and screws. A Pi with this HAT will fit in most cases that have just a little room above the Pi.However: I wanted to build a Raspberry Pi 4B NTP server. The pulse-per-second (PPS) is just the PPS LED blinking, and that signal is not connected to a GPIO pin so I can't build a super-accurate NTP server with it. I have learned that "GPS with PPS" isn't enough when the PPS is just one blink per second ... See also https://www.amazon.com/gp/customer-reviews/R1I0BIBRXSIZHC/As long as you don't want PPS on GPIO, this seems like a nice little GPS HAT.