It has one, it’s just well hidden!
The GPSMap 62s can be paired with an appropriate amateur radio for full APRS functionality.
Some brief history before I begin…
Most modern GPS devices have dropped their old fashioned RS-232 serial ports in favor of the much more user friendly USB port. This makes interfacing them to amateur radio projects much harder, bordering on impossible. While standard serial ports could be thought of as a peer to peer system, USB was designed to work as a client server model with the “server” requiring much more intelligence than we generally have available in our projects. To make matters worse, despite it’s name “Universal Serial Bus” the creators didn’t impose any universal “driver” for serial communications the way they did with mice, keyboards, audio devices, etc. These factors all combine to make USB very unfriendly for us hams.