Refurbished GPS Units are recertified by the manufacturers to meet the original standards of new units.  Refurbished GPS Units will come with a warranty just like a new unit.  Refurbished GPS Units for whatever reason are either returns to the manufacturer or pulls from the assembly lines by quality control and remanufactured.  Refurbished GPS Units are like buying new units except at a discounted price.  Don't be afraid to purchase Refurbished GPS Units as they have basically been double checked and are offered at a bargain price.  Don't forget they come with a warranty too.  You find that most of the major manufacturers, Garmin Nuvi GPS, Magellan GPS and TomTom GPS, offer Refurbished GPS Units