Such a large compass would be difficult to work with. The compass at left is a typical golf-pencil compass that seems to be preferred by many of the students. I do not recommend it. The whole point of a compass is to draw an arc with constant radius. This model tends to slip easily.
Friction is the only thing holding the radius.
As it wears out, it becomes even looser. Also, the point is not very sharp, so it will not hold its position well when drawing. Two advantages are that it is easy to find and it is inexpensive. The compass on the right is a much better design. The wheel in the center allows for fine adjustment of the radius, and it keeps the radius from slipping.