Pedometer?

[Camron Rust]

I'd bet that thest things would be horribily inaccurate for reffing.

I beleive that most, if not all, of them work by counting strides and mulitplying by the length of your stride (a setting that you give it). For runners, walkers, and joggers, that is probably a close assumption. For officiating, the stride would vary so much, you could be 2-3x off.