Martin is initially reported as hanging out near the clubhouse, looking at houses and acting suspiciously. Then he walks by Zimmermans truck at around 1:30 on the 911 call and proceeds east.(So Zimmerman's truck was pared at 'C' when he initially spotted Martin? And Martin walks by Zimmerman's truck? and at Twin Trees?
The image below is an aerial shot of the neighborhood. Martins location is marked in yellow, and Zimmermans in red.
Martin couldnt have been walking on Twin Trees because ten seconds into his call Zimmerman said that Martin was on "Retreat View Circle.
http://www.logarchism.com/2012/04/02/trayvon-martin-timeline-of-february-26/