Funny thing about the ppl using the radar program to find hunt marks. It seems to only search for the name and display the location. I've been running to remote areas of various zones after renaming my chocobo to share the name of a local A or S rank mark and get a swarm of ppl running to me within a minute. One of these a FC mate actually saw them teleport in at the aetherite and he followed them as they made a bee-line to my location. There was no shouts, emotes, nothing. Kept completely quiet about it and no other random players were nearby until the swarm arrived.