The Explorers Guild is a global organization that places people looking for Discoveries together with people capable of finding them. Most, not all, attempts to locate discoveries will start at the Explorers Guild. They compile information, both known and merely rumored, find someone who is willing to pay for the information and location of the discovery and then put it up as a guild discovery posting. When the discovery is found and verified by a guild representative, the guild labels it as found and remove all posting for the discovery, so as to cause minimal conflict.
Typically, a guild rep will head out with a crew AFTER an expidition has returned to verify a discovery. This can take time but the guild has a reputation for paying VERY well for good intel and even better for an actual discovery. Many airship captains will look for discoveries on the side, but few ever find them. Most of the successes are achieved by dedicated explorers who make a living off of the guild.