There is a new question type that I have made called coordinates question type. It covers all functionality of the existing calculated question plus additional features (though not directly extended from it).

• Allow the input of coordinates or vector as an answer
• It can have multiple subquestions that share the same random variables which does not exist in calculated qtype.
• Allow finite trials of a question with mark deduction, say, 100%, 60% and then 20%. It is good for student learning because the infinite trial of adaptive mode can only train the student to guess, not think.
• Sophisticated unit checking which will convert answer with different units automatically, say 1100 mm, 110 cm, 1.1 m and 0.011 km are all graded correct.

Main page: http://code.google.com/p/moodle-coordinate-question
Documentation: http://code.google.com/p/moodle-coordinate-question/wiki/CreateQuestion
Download: http://code.google.com/p/moodle-coordinate-question/downloads/list
Example import file: http://moodle-coordinate-question.googlecode.com/files/demo-coordinates.xml

The installation is exactly the same as other question type plugin, as shown in the documentation.