There's many reasons why you would use multiple GPS. I'm sure Woz was being Woz and testing which works the best by flat out competing them against each other and his own knowledge.
Plus I remember having a GPS tell me I was at my destination in downtown Manchester when we were actually 5km from the street address. I had another tell me to perform a U-turn on a one way street when I missed a turn that didn't exist.
I don't see it as odd, I'm sure at once one time he was carrying 10 cell phones to see which ones he actually wanted to keep. IIRC he said he usually keeps an iPhone and a Blackberry on him at all times, which I'd imagine would be his main pair, beyond that he'd probably simply be testing newer phones or different styles to see if they're better.
Plus I remember having a GPS tell me I was at my destination in downtown Manchester when we were actually 5km from the street address. I had another tell me to perform a U-turn on a one way street when I missed a turn that didn't exist.
I don't see it as odd, I'm sure at once one time he was carrying 10 cell phones to see which ones he actually wanted to keep. IIRC he said he usually keeps an iPhone and a Blackberry on him at all times, which I'd imagine would be his main pair, beyond that he'd probably simply be testing newer phones or different styles to see if they're better.