Hi Ozboy, us Canadians got binumeral tapes, fractional inch above decimal metric so we can make two different wrong measurements at once. Like the Gimli Glider. That aircraft ran out of fuel just east of Winnipeg and they glided all the way to an abandoned airstrip in Gimli MB. The error was mis-reading the fuel tank drop tubes. The screwup was not recognising that the only safe way to fly when your aircraft's fuel gauges ain't working is to say "screw the economics and top off the tanks"