I am used to driving with a GPS which measures in kilometers and metres. So the conversion between kilometres to meters is just a question of moving the decimal

I am used to driving with a GPS which measures in kilometers and metres. So the conversion between kilometres to meters is just a question of moving the decimal point: 0.5 kilometre is 500 metres, 0.25 kilometer is 250 metres, and so forth. When I drove in Britain which uses miles on their GPS, it was disconcerting to see the GPS ranges go down steadily to 2 miles, 1 mile, 0.5 miles, 0.25 miles then a discontinuity when the size of the numbers bounces back up to 400 yards before declining again to 300 yards, etc. I know it's really just a matter of what you're used to, but it's difficult to get your head around completely different systems of measurement when you need to be able to think quickly.