This means that ham radio transmissions are meant to be received by other ham radio operators. The Ham Radio hobby are a bunch of proud people that take their hobby seriously. They are and have always been the greatest people I have ever run across. I am proud that I am part of this group. If You would like to join these great people.
Field day is a way for hams to get outdoors and have fun under some difficult conditions.
But it is also a chance to fine-tune emergency communication skills. Using generators and battery power, and set up antennas in the field. The idea is to put together a self-sufficient, working station quickly and making contacts. The idea is to establish emergency communications during floods, hurricanes, fires,earthquakes and other major disasters. You can check out the ARRL web sit for more information.