Hello from China

Maybe everyone else knows, but I don't. What do you mean when you say "north finding" is a type of surveying you do?

@warrenward Thank you, Mr. Warren Ward. Your personal experience is interesting. Thanks for sharing.

@flga-2-2?ÿ Thank you, sir. That's very kind of you.

@lurker?ÿ Hello Mr. Lurker, in some areas in which other methods cannot be efficiently used, for example in mining and tunnelling, gyroscopes are widely used in determining direction. It is a type of surveying we do.?ÿ Thank you!