Packet operates at 1200 baud and is used mainly on the VHF bands using FM.
This provides the reduced noise levels that seriously degrade the signal to such a point that communication would be impossible.
The most common use for packet is for APRS – Automatic Position Reporting System mostly on 2m (144.800MHz) VHF.
This system simply sends short bursts of data giving information on the sending stations identity, location, heading, speed and any extra short length of information the operator may wish to add.
Much like the old dial-up BBS services that were popular a few years ago, this has got left behind from modern technology. That’s not to say it’s no longer used.