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Izroth and his party followed the coordinates given by Niflheim. The coordinates did not lead to the raid location itself, but instead, it marked the final gathering location of the raid party before their entry into the raid. These steps may seem somewhat excessive, however, there was too much at stake for Blue Oasis if the exact location was leaked beforehand.
They knew that as soon as they entered into the raid, it would be broadcast to the entire world. Once this happened, the other top guilds would all scramble to the location of the coordinates. More importantly, since Blue Oasis held the advantage over the other top guilds, this would only act to make them public enemy number one for a large variety of reasons. This was even more so if they were successful in their attempt to clear the raid on the Hardcore difficulty.