If the receiving station detects an error, it discards the faulty packet and does nothing. After a certain amount of time has passed without an ACK from the receiving station, the transmitting station sends the packet again. Amateur packet exists as a loose global network. Through packet radio, you can tap into this continuously flowing stream of data and exchange information with stations throughout the nation and the world. You'll also find packet on 222 MHz and 420 MHz.
Every amateur has different uses for packet.
Some view packet as a tool to enhance their overall enjoyment of Amateur Radio. Others take it further, using packet as their primary means of communication. Some bulletin boards offer additional services such as electronic call sign directories and magazine bibliographies. DX PacketClusters support other useful features as well. Many satellites function as orbiting bulletin boards, relaying packet messages around the world.