Hockey pitches are bigger than I remember.I umpire hockey matches [...] Their range is pretty decent too - I'd say getting on for 800m-1km with a clear line-of-sight.
Heliograph.
It's not the size of the pitch, it's the fact that you can still hear your colleague when he's at the far end of the car park or in the loo and has forgotten to unplug! DAMHIKT We used the radios on a London-Paris ride too, which is where the distance comes from.Hockey pitches are bigger than I remember.