cwc - I think you can relax. I have got away with it for years. IF you conduct your navigation on a space-frame orientation you will probably need to correct for Coriolis. IF, however, you navigate between points on the earth's surface using earth-based references (heading, track, 'normal' INS, drift etc) you should be OK. If, however, you consistently find yourself missing your destination to the left in Oz, I would tweak it a couple of degrees right.
Any chance of a link to the "commonwealth bureau of meteorology" article? I'm always looking for a new drift on ideas.