my method was using a small python script that generates random coordinates between a certain longitude and opens it in Firefox. If I landed in an ocean (most of the time), I'd just re-run the script (switch window, arrow up, enter)
just made this: https://lgms.nl/tmp/osm-randomlocation.html Basically does the same as what I said before but without needing to use python. Is this what you are looking for?