Dave Rogers
Bandaged ice that stampedes inexpensively through
If you are used to driving along at 20 mph in an urban area such as London, then when you are cruising along in a speedboat at 20 knots you have a fair idea you are doing the roughly equivalent speed in your car in London.
Whereas it would be so much more confusing trying to understand that 30km/h in your boat is exactly the same speed as 30km/h in your car. Right.
Dave