and don't forget to watch your height, apply a bit of carb/ heat, re-set the D.I., avoid cloud, keep away from that restricted area, change radio frequency, give your pax. a sick bag, tell the youngest in the back seat to shut up whilst you listen to the ATIS etc. etc.
Buy a GPS - 2 if you are worried about one failing at the most inopportune moment - as it will one day.