I had an Infiniti FX 35 and the dead reckoning never really worked well in the city. With the tall buildings in midtown, it lost GPS quite a bit and it even thought I was driving on the hudson river once and not thru Lincoln tunnel! Apparently I've also taken my car to the top of the empire state building and through madison square garden. Once I get to the village and downtown areas though, it works fine and that's where you really need GPS since the streets have actual names.
Guess it depends on the car and how well the system is implemented.
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I had an Infiniti FX 35 and the dead reckoning never really worked well in the city. With the tall buildings in midtown, it lost GPS quite a bit and it even thought I was driving on the hudson river once and not thru Lincoln tunnel! Apparently I've also taken my car to the top of the empire state building and through madison square garden. Once I get to the village and downtown areas though, it works fine and that's where you really need GPS since the streets have actual names.
Guess it depends on the car and how well the system is implemented.