Easy USER solution
Just print out … and use it when setting the weather UI
After a time , you end up referring back to it less and less, as you get “educated” !!!
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Well, as for easy, you are not joking.
I am just in love with my SI unit, just the ATC sound of “QNH 1013” is music to my hear.
But I am just surprised that the imperial system with it’s love with fraction, clean divided number, is using decimals
Also apart from the USA, who is flying in Liberia and Myanmar?
Typically fractions are just used for inches or small volumetric quantities for cooking (cups, tsp, etc). Most other Imperial measurements use decimals.
Thanks for the precision,
I remembered in Thailand, SI country, during a cooking class, it was all in imperial measurement for the volume.
When I asked my thai girlfriend at the time to inquire about it, she found out that they were selling the special measuring tools “1/4cups, 1/2tsp, etc” at ten time the cost at the end of the class.
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I’m an old guy. Canada was just switching to SI in the mid/late 70s as I started school. So I learned both systems and am mostly comfortable with both and can readily convert most units back and forth in my head with relative ease. The exception is the absolutely senseless Freedomheit scale.
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To tell you the truth, I really love the metric system, but after coming back from New Zealand flying the C172, I started flying on the DR400 in France, not only I hated the flap lever because you try to handle it like a car parking brake, but I was missing my KNOTS
So yeah, I can understand your point of view
To me it totally depends what I am flying :D. In glider planes or UL I am totally used to km/h, so I feel right when I approach at 100km/h or when I have to be at the position in a height of 180m minimum. When I fly a C172 or Skyvan I know its speeds in knots, my brain works comfortably with feet and nautical miles. I would probably be confused if I flew a Cessna which showed a metric panel. There is a rough feeling for the values, like 80 knots is 150km/h but our brain doesn‘t like to convert or calculate when it has to focus on something else. So when we are used to something in a certain unit it‘s best to do it so as long as it‘s practical. Of course, you don‘t make many friends when you‘re flying and IFR approach and the controller tells you to remain 90 knots and you ask him if he has it in km/h 
there is a freedom of units (forgive the pun lol) as long as nobody‘s involved but you have to stick to some rules when you work with others
Also, don‘t ever ask me to calculate a flight distance and time required in metrics, my head immediately switches to knots and nautical miles. I was flying with my parents to our family in northern Germany and right before takeoff my mom asked me how far it was as she only knew the distance on the road. When I only could tell her it‘s 270 miles, about 3 hours, her face was priceless. I pointed at the ASI and the low numbers (knots) confused her for a moment… she thought we would fly faster. She read km/h
Another example, temperature decreases 2 degrees Celsius every 1000ft of altitude. I can convert 1000 ft to 300m but it‘s much easier to have a feeling for being at 1000 ft now and your hiking trail will lead you up to 9000 ft so its about 16 deg cooler up there so yes, take a jacket with you. Round values do have some advatages 
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