 if a person knows the cardinal direction of the shore, and uses a compass to determine their cardinal direction, then they can direct themselves to the shore & a magnetic chain is a mean of sweater -> if a person knows the cardinal direction of the shore, and uses a magnetic compass to determine their cardinal direction, then they can direct themselves to the shore if a person knows the cardinal direction of the shore, and uses a magnetic compass to determine their cardinal direction, then they can direct themselves to the shore