[JugglingReferee]

At camp I was taught to always use "coach".

Then one game an official was injured and an evaluator/clinician actually filled in. It was good because we were afforded the opportunity to see how a higher up does the game.

This higher up used the coaches' first name. So now the rooks are rightfully confused. It was a case of the fill-in knowing the coach for years of officiating his games. So your area might be like that, too: where the old boys do what they want.

I've found that coaches are respectable if you work hard, and before or after the game, respond well to using their first name. During the game, if I have to do my job, it's always "coach".

I think it's a When in Rome thing, with most areas leaning to using 'coach'.