While the
most recent JACC media release at the moment I am typing advises that Haixun 01 and Echo are at the southern end of the underwater search area, with Ocean Shield at the northern, the current display of Echo position, track, and speed made good on marinetraffic.com shows Echo making 15.5 knots on a 37 degree course appearing to aim very closely at Ocean Shield's current position.
Meanwhile Haixun 01 shows as 16.7 knots on course 333, having made much progress toward the current surface search area.
They may never say this, but the disposition (and transit speeds, which are inconsistent with acoustic search) of the ships suggests to me that the much-discussed Chinese pinger contact is no longer being prosecuted, and that Echo may be transitting for sidescan sonar or other service at the site of the Ocean Shield contacts.