I have no experience with a GSP system, but I'm thinking of buying onf for my Cali trip since I'll be renting a car. Please forgive my ignorance, but will a GSP purchased in NYC work in Cali?? Do these systems only work in the area where they're bought, like are they programmed only with local street info from where they're bought? Should I just buy a Cali map?? I want to drive from LGB to DL, then the next day I want to drive from DL to Malibu, and then down through LA/Hollywood back to DL. Can I trust a GPS to give me the best directions? Do I have tp program in actual addresses for it to work? Because I don't have an address to aim for in Malibu, would it still work? I basically want to drive up the PCH. I guess if I need an address I can find a restaurant or something to put in. But then what about Hollywood/LA? XCan I just tell the GPS I want to go from Malibu ti the Hollywood sign? Any advice would be GREATLY appreciated!