I'm not at all worried about the amount of "tracking" Google or anyone else does, I honestly couldn't be bothered to waste my time worrying about it.
If you can get past Google looking at everything you do it really is pretty cool.
Sent from my Really Big Phone
I've never had a problem per se with the data collection Google performs on me through their services, but it's encouraging to see them turn around and send the data back at us in cool ways like this.
Oh no....
That is creepy.
I turned off my location history to stop it. If the OP has location history on in his Google account, and Google Maps on his iPad, had his wife taken it with her, he could have seen whether she went to the store or not. (Not in real time, but the next day).
And, THAT is why I don't like having Google follow me. Because even though they claim only you can see it, anyone that has your phone - child, coworker, or in the OP's case, his account on an iPad, could see it. I mean, his wife could see the same things about him from his phone data, on the iPad. This is all without the other person knowing they are being tracked while going about their day or the person finding it even necessarily meaning to come across the info - like what actually happened in this story.
If you've never seen this in maps, you should look at it. It is basically a tracking device. From the moment you move it gives you where you were, name and address, time you were there, when you left, where you went next, how far you drove, until the day ends. Not long before they start talking about this feature on crime shows to get a victim's last movements or check an alibi. Could help them find someone too who might be missing.
Sent from my totally awesome Sprint Galaxy Nexus, even if I don't know all its secrets yet.