  The students build and use an old navigational tool from the Arab world of
the 9th century, the kamal. After an introduction to historic seafaring and
navigation, they build this simple tool and understand how it can be used to
measure angles. After learning that the elevation of Polaris is (almost)
identical to the latitude of the observer, they apply this knowledge while
using the kamal. During a field trip, they actually measure the elevation of
Polaris. The result is compared with modern methods.
