I use slide rules to help students understand what logarithms are about. I also use them teaching navigation. I have a bunch of them, both linear and circular, which I hand out for use in class.
Spoor comes from the Netherlands word for “track”.For example in Dutch a railroad is a “spoorweg” or a “track way”. Thus most directly here we are talking about footprints although the other signs of passage of a bear would also be part of the “track”.
Rowers face aft.