There are Andriod GPS apps, such as Europe Offline Map & Guide or London offline map Guide, that don't use data; you don't even have to be connected.
Don't know about iOS apps, but probably.
There are Andriod GPS apps, such as Europe Offline Map & Guide or London offline map Guide, that don't use data; you don't even have to be connected.
Don't know about iOS apps, but probably.