1570 J. Dee in H. Billingsley tr. Euclid Math. Præf. sig. aiiijv Of the Variacion of the Compas, from true Northe.
1773 J. Draper 21 In most places there is a sensible deviation from true north.
2009 20 May 15/4 Grid north depends on the map one is using; it differs from true north, defined as the direction towards the geographic north pole.