escritora, if you think there's nothing to be gained from listening to the actual call, in which you can hear things that provide clues to when Zimmerman is in a vehicle, when he is moving, etc, I guess there's no point in discussing it further. Though even from the transcript, it's clear to me he's in or with his truck when he's calling. And just for more info, I looked up the address he initially gives, and then the address police give as the crime scene. It's worth a look (I can't figure out how to link to directions I looked up on Google maps, but the first address is 111 Retreat View Circle, Sanford, FL and the second is 1231 Twin Trees Lane, Sanford, FL).
IMO, there's no way, given Zimmerman's 911 call and the map, let alone the other 911 calls, that he stayed with his truck and didn't follow Trayvon. But I get that you aren't in agreement, and that's fine. I appreciate that you're digging in and looking for more information. I like to do that, as well.