Ok almost all the abilities if not all of them say that its a 20 foot raidus. As mentioned on the vampire info thread this causes holds and such. I know it was suggested and I personally agree that if you hear it and it affects you then you need to response. And just like in most games it gives you a more exact idea the closer they are and those farther off only gives you a general area. So in conclusion my vote is if you hear it you answer.
But what is the official answer on this?
PlotChris
Nick : Extra Undead Activity Posts : 172 Join date : 2009-05-13 Age : 37 Location : In the hearts and minds of all true dreamers
Subject: Re: Sense Abilities Mon Jul 26, 2010 8:44 am
Yeah. All that has bit the dust.
If you hear someone call a Sense ability that applies to you, you respond to it answering 'One!'
Subject: Sense Abilities 
Sat Jul 24, 2010 5:35 pm