There is plenty of（）at this area.

There is not（）depth of water around the area centered at the lighthouse.

Tripping defects in anchors frequently occur in（）.

The expression DROP ANCHOR means（）.

PAN-PAN repeated three times over the radiotelephone indicates which type of message will follow?（）

The best method to stop a vessel from dragging anchor in a sand bottom is to（）.

What is required to launch a boat stowed in a crescent davit?（）

Which radiotelephone signal indicates receipt of a distress message?（）

What happens to the efficiency of an anchor when it is moved from sand to mud?（）

What form of ice is of land origin?（）