Whistle on a throw-in

We've been instructed to blow the whistle after a lengthy delay like a timeout, injury, DQ sub etc.
We also blow the whistle when you are lead and the ball is staying in the frontcourt.

[eyezen]

I blow the whistle after an delay; ball chased, subs, etc. It's usually a short toot, a bit longer after a timeout, depends on the environment.

I say "spot throw in" with the point down motion or "you have the baseline" with swinging arm motion only when on the endline going the other way. Everything else is a spot throw in by nature.

I blow the whistle for subs because most of the tables around here are incompetent and don't use the horn properly by rule and also because some partners don't hand off subs properly even though it's been pregamed.