(according to the public maps) is a good disclaimer to add. If you believe those maps, they are basically disregarding the Persian Gulf for example, to a degree that I find wildly inconsistent with the volume and intensity of US diplomatic, political and military intervention in the area. I strongly suspect they've got the whole area mic'd, but under a new program that's "deployment-specific" and more secret. But if they were to offer their observations to the search effort, they would be exposing the existence and possibly the locations of any hydrophones.