we be so happy when we buy we first GPS unit 8 month ago . but we experience with TomTom GO510 have be a frustrating one . the unit require frequent reset , sometimes right in the middle of unfamiliar place . if we ever forget to bring a pin , we have to resort to the good old map to get we out of the jam . to TomTom 's credit , it do replace promptly we dead unit after initial 2 month of use . but the unit consistently fail to find we California home , even after a most recent map update . grant , the housing development be only about 2 year old . but , we have report its coordinate to TomTom right after we receive the unit . it be even more ridiculous when the unit report error during a recent route computation from New Jersey to the JFK Airport . TomTom 510 be not worth the price .