so I was wondering, why cant we just buy a USB cable that attatches to a GPS antenna, instal some GPS soft, and bam, have a 17 inch GPS screen.? I was checking out these guys http://www.gpsy.com/ and you have to buy a GPS receiver, like a handheld one, then plug it in to you mac, then buy their soft for 60 bux, oh also a cable to connect the portable GPS to your mac. so it comes out to like 300 bux ! WTF !? this dude had a PC laptop, and all he bought was a 100 dollar program, that came with the USB cable AND the GPS antenna ! so what the deal for us MBP and MB users ?