In the remains of a small cabin in the bow of the ship and in a few other locations around the wreck was found the earliest dated set of navigation instruments in Europe found so far: compasses, divider calipers, a stick used for charting, protractors, sounding leads, tide calculators and a logreel, an instrument for calculating speed. Several of these objects are not only unique in having such an early, definite dating, but also because they pre-date written records of their use; protractors would have reasonably been used to measure bearings and courses on maps, but sea charts are not known to have been used by English navigators during the first half of the 16th century, compasses were not depicted on English ships until the 1560s, and the first mention of a logreel is from 1574.