I used Ovi maps on my E71 when I was away overseas last year, it was great being able to have the UK, Germany, Finland, New York, Montreal and Vancouver on my phone and know exactly where I was!
I have used tomtom GPS with local maps installed whenever driving in Australia, recently installed sygic maps on PDA but yet to use it overseas, Will use it in Australia and UK later this year. On previous PDA had MapKing maps installed when travelling in Asia; Singapore, Maylasia and China. It worked well for me.
Depends what you define as "expensive" - Ovi maps is totally free but using AGPS for a a quicker pisition fix does use a small amount of data which is either $10 or $30 MB while roaming.
I thought that I am not a good map reader, if I had to establish a green line and for me just to follow that .. that would be more expensive, ie., roaming data and navigation.
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