Originally Posted by nybimmerfan
A GPS system is only as good as the provided digital map. I have never experienced any problems yet with the M5 NAV system in the Queens,NYC and Nassau County LI area where I have used it so far. I have not had the chance using it around Manhattan where due to the tall buildings, GPS signal is sometimes lost (the system needs to be able to get signals from at least 4 satellites to pinpoint the car's location in space.
Manhattan is fine albeit a bit longer to load up.