So the charger does seem to charge about 30% faster then a average car charger. Every single time I have tried to use the gps function it doesnt work. Either its like 1,000+ meters off, or there isnt a signal in the parking garage. If you live in a city, and park in parking garages, this is why we purchase these things! Well it NEVER WORKS in garages. Even up or down by only one floor!