"We have to be careful not to send it in the wrong place. But we also wanted to get it out there as close as we can to what we believe is the right place," Marks said.
The Ocean Shield will take three days to reach the search zone, giving Marks' team only days to locate the black box before the locator beacon's batteries, designed to last 30 days, are expected to run out. Malaysia Airlines Flight 370 has been missing for 23 days.
When deployed, the locator equipment will be towed behind the ship so that it can scan for pings from the locator beacon.
Monday's search concluded with "nothing significant to report," the Australian Maritime Safety Authority announced via Twitter.
#MH370 search operations have concluded for today. All aircraft returning, nothing significant to report. Search will resume tomorrow.— AMSA News (@AMSA_News) March 31, 2014