Had an 'older' official give me a tip I wanted to pass along. It came from working my first 'big' JV game and having the arrow up on the scoreboard.
Prior to this game all my games had an arrow at the scoring table so direction was a pretty easy matter. But up on the wall at the end of the gym was a new deal for me.
A habit of carrying an extra whistle had already been ingrained from working football, so I carried one with me working BB too. Seemed like a good idea to me anyway. So to keep track of the PA I simply switch my whistle from one pocket to the other. When there is a JB whichever side my whistle is on while facing the benches indicates the direction of the ball.
Now if I can only remember to switch the whistle every time...