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I stumbled across Google Latitude last night. And Vickie and I have been playing with it today.
It's an app for GPS capable smart phones. Download it to your phone and then your friends (which you must invite to join you) can watch your progress in almost real time on the Google Latitude webpage. You log in with your Google Account (which you can activate even without a Google email address).
My Google Latitude "friends" right now are Vickie and my brother, Mike. Mike doesn't have a gmail account, so I invited him and he accepted, using his yahoo account. Vickie used her Google account.
Anyway, Vickie went shopping this morning and I could watch her progress as she drove around her town. I called her and asked if she was at such-and-such shopping center, and she said, yes - right next door!
Next test, I took my iPad (3G on) and walked to the end of my driveway. My brother was watching my little icon move on his Google Latitude page. Very cool.
Then, I turned off both my iPad's wifi and 3G connections. The iPad still showed my movement, but it didn't make it to the internet because it had no way to get there. But for me, it was acting like a large-screen GPS.
You can "check-in" whenever you want (I'm still not clear how that works), and there is a history that people can view of those places you've checked in.
I still need to poke around it more, but Mike is excited (as excited as most men ever get, unless YOU-KNOW-WHAT is involved...) to be able to follow me in almost real time!
That's all I know for now.
Oh, and I forgot to mention - Vickie is a Doofus. But I think most of you knew that.
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