One option would be to build additional Polaris platforms and keep more of them at sea.

So the fishermen fish even harder, to make up the catches they need to keep their vessels at sea.

For the Navy, the cost of keeping an aircraft carrier at sea runs about half a million dollars a day.

Wind and weather kept them at sea nearly longer than their food and water supply could last.

The storm kept Calliope at sea the next two days.

And I said, "This is because of the long watch we have kept at sea.

These workers sign contracts that keep them at sea 4 to 10 months.

Blake kept the fleet at sea throughout an entire winter in order to maintain the blockade.

Thus, she began a career which kept her at sea during much of the Civil War.

But there were no clocks that could keep accurate time at sea.