We have a snooper s6000 that needs a map update, £99 for 1 or £140 for lifetime updates. ...or we can buy a new Chinese sat nav for around £50 with lifetime map updates. ..or we can download an app like sygic which would make using motorhome parking app work without copying coords and inserting them into a sat nav for £140... The former 2 has 7 inch screens the tablet has 8.4 inch screen. Which would be the best choice? The snooper is 5 years old now.