Amazing, and sad
Knots is not an SI unit though, it is the imperial unit used for windspeed and speed in sailing and aviation all over the world.
Here in northern Europe we have adapted to this foreign unit instead of always using SI (m/s) as the imperial knots is so common and people all over the world talk the same language which is great
Where it goes really wrong (and the only situation luckily) is when storms or hurricanes are present, then the girly news reporters always use km/h (or in US I would expect mph) as it is a unit everyone knows from driving a car, so understandable this is what most can relate to.
Problem is it is utterly nonsese to understand and converting to something we as surfers/sailors can understand ha haa - but in a news flash it sounds good, also because the "number" in itself is higher which sounds more "uuuuh, scary"
Again, every wind meter without exception I have seen, have had 4 units you can choose between: knots or m/s or mph or km/h.
Which in itself is fine, but leads many to bad habits too I could imagine, instead of talking about something we all can share locally and internationally like on this forum.
It is good the conversion between Imperial and SI (knots and m/s) is so close to a factor 2 that we can convert without thinking, and even have a "feel" for the other unit so to speak.
Whereas km/h or mph are utterly useless as they are 54 % and 87 % compared to knots, so both off and you can never remember which way, is mph a bit less or a bit more than knots ?
Sorry, this should have had its own thread, I know...
But when saying a 7-10 mile day it is really confusing, as it could be seamiles per hour (or nautical miles per hour same thing) which is knots, and it could be miles per hour which is less than 87 % of knots.