iPhone 4 GPS with Navigon vs TomTom 540TM XXL

Going by the philosophy two is one, and one is none, I travel with backups of anything important to get the job done. For car navigation, that means my iPhone 4 with Navigon and my TomTom 540TM XXL. The following is based on my observations based on using a dedicated TomTom unit versus the Navigon GPS navigation software on my iPhone 4.
google's 2-step authentication process arrived just in time
It seems that my account got hacked somehow. I can't confirm whether it was a service that I used which was detected as suspicious or not, but it was time to beef up security anyway. I'm going to guess it was from logging into a public library.
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RT from Andy