It might be easier to do that math, but how difficult is it really? I think I can handle the calculations fairly easily in either system.

What I think it more difficult to switch is judgment. When you are judging distance and communicating it to someone, speaking to them in terms they understand is key. When I worked afloat, telling someone they were "ten feet" off or in a certain direction communicated something they understoood. Three meters was something that would have required them to think.

Either system works and converting from one to the other is simple enough. Converting our brian waves to think in meters is not so simple. It's like elarnign to think in a new language. I can speak a language besides English to some extent, but my brian will not think in anything else. We would need to be immersed in the mertic system to be able to think in it, and there would be a difficult time of adjustment.