Useless and impractical
Impractical: every time the GPS unit turns on and connects with the phone you have to sign in. If youre already driving youll have to stop to go through the process of signing in the app, or do it while driving (that shouldnt be the case).
Useless: once you get the phone and the unit to connect theres no practical use between the two. The unit works perfectly fine without connecting, which begs the question: "Why am I going through the trouble of connecting each single time?"
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TomTom MyDrive™