Improved boom device was later arise. Dual topper derrick boom device is operated by a single lever improvements made, the device only cargo runners and about two separate topper. Crane boom by a winch and two topping winch to manipulate, easy to tower crane bearing operate, high working efficiency. Hebert derrick boom device by double-lever operation improvements made, the device has a cargo winches, extremely heavy winch cable and lanyard. With the winch boom may soon put in any position. While also pointing put cargo lifting and fall within the working radius of the boom to improve handling efficiency. This is an important step towards fully automated cargo handling forward.

Deck crane
Set machinery in the ship deck. This compact crane structure, the ship has more deck area available, less impact on the bridge upstairs sight. Deck cranes easy operation, high working efficiency, and flexibility, before the job is no tedious preparatory work widely.
Deck cranes commonly used fixed rotating cranes, mobile cranes and gantry cranes rotation. Transmission power transmission and electricity - two hydraulic drive.
Fixed rotating crane
This crane most widely used, can be used alone self aligning ball bearings or in pairs in the starboard job. Weight is generally 3 to 5 tons. In the multi-purpose boat, requires a single crane can lift a 20 ft container, twin-lift can lift 40 feet container (30 tons), its starting weight of up to 25 to 30 tons.