Good

I used this app in Scotland (with iPad and a an "O2" data prepaid card I have got for this 15 days) and it was very helpful and useful! Very good indications and good real-time services like traffic and weather and speed cameras!
I dont know about using it with no cell data! Ill try!

FedEx1981 about Sygic UK & Ireland: GPS Navigation, v11.2.2