Legal Sub or BOO

[Forest Ump]

I actually had this happen in a JV game last Saturday. The DC thought the batter was out because he didn't tell me he was entering the game after he had received a few pitches. I told him no out coach, he's an un-announced sub. He entered the game when he stepped in the box and I said play. The head coach believed it but I could hear the AC in the dugout going off about how he had never heard of an un-announced sub in all his years in the game and blah, blah, blah.

You can't have a BOO when a sub enters un-announced. He will always be a proper batter because he takes the slot that is due up.

It's really a shame to hear that a HS umpire is screwing up calls like that.