This email reads to me like one of those "Warning - pass this on to everyone you know !" emails that do have some truth to them, but are a bit misleading, skimming over the more important points, and probably not really being about a specific incident.
The lesson about the GPS is not that 'home' was programmed into it, but that a GPS was left in a parked car in the first place !
You should also avoid leaving any bills, reciepts or other correspondence with your address or other personal details on it in your parked car.
The moral of the mobile phone story as stated in that email, should actually be the same caution that banks and other financial institutions repeatedly issue - do not reveal your PIN to anyone.
As far as having 'home' or husband/mother/father etc., programmed into your mobile phone, I don't see how it's any worse than some people having "ICE" (in case of emergency) in their phone contact list, as ICE is more than likely to be someone of significance to the mobile phone owner.
Bosco !
Bosco !
Bosco !
