Gentlemen,
Somewhere there was a post complaining that the crane drifted slowly backward—away from the ship. This actually allows you to position accurately in that direction.
If you have not done so, you can download INFO1.pdf from here:
http://www.shipsim.com/ShipSimForum/index.php/topic,2886.0.html (http://www.shipsim.com/ShipSimForum/index.php/topic,2886.0.html)
That document has instructions for the crane.
Although the supplied basic container-loading tutorial mission has only four containers, missions an be made with up to 10 containers—the maximum that Vermaas can accept.
There are other missions that involve the container crane, with more containers. Creators usually use a small number lest the players find it too difficult.
More information on crane missions can be found in the Mission Editor Tutorial that you can download from the same post as INFO1.pdf.
Regards,
Marty