One of the things that radio amateurs have to deal with, whether they like it or not, is the propagation of radio waves. And they study it to be successful. The many radio beacons (beacons) also help with this.
There are different headlights. Some broadcast different signals on a certain schedule, others – exact frequencies, others – navigation signals, etc.
There are radio beacons not only on the amateur ranges.
One of the most famous amateur radio beacons is W1AW. It broadcasts on a fixed schedule CW with different speeds, AMTOR, voice, etc. Information on it and all the others can be found in ARRL Publications on the Internet.