If in-game, we currently have three potential new sources of information, but Van's latest email suggests that we're only going to want one of the three:
know the stars of Cassiopeia and you will know when you've reached your destination.
Presumably as some point we will find the W-shape star pattern of Cassiopeia. I suspect it either will be on one of those three sites, thereby designating it as the proper one, or it will appear somewhere else and point us to one of these three sites, thereby designating it as the proper one.
It should also, possibly, be noted that the names of the three sites, according to their domain records, have specific and deliberate spacing and/or capitalization.