The compass is useful as a navigation tool because Earth's magnetic field is relatively simple, and has magnetic "poles" located near the north and south geographic poles.
(The compass; is; useful as a navigation tool; because Earth's magnetic field is relatively simple, and has magnetic "poles) (Earth's magnetic field; is; relatively simple) (Earth's magnetic field; has; magnetic "poles" located near the north and south geographic poles) (magnetic "poles; located; L:near the north and south geographic poles)
The compass Earth's magnetic field Earth's magnetic field magnetic "poles
is is has located
useful as a navigation tool because Earth's magnetic field is relatively simple, and has magnetic "poles
relatively simple
magnetic "poles" located near the north and south geographic poles
L:near the north and south geographic poles