It sends out packets with your info. In order to see other hams you need to attach a computer or I think it supports several GPS units. On the radio (TM710) you can also do messaging, and it lists out other hams and distance from you and direction travelling etc.
I don't think I have mine set up right yet, because I cannot see myself on the website when I have the radio on. After my issue on the DRC repeater I haven't tried anything new in the HAM world.