Yes, I used it today to get to Manchester with no connection. You need to download and save the maps on your phone, use the Nokia Map Loader software (also free). In off line mode it also knows all the local amenities including petrol, shops, hotels etc. Nokia are promising free updates to maps as well. My ancient Navman is heading for the bin for in car sat nav!
Be warned though it does eat the battery, I just need an in car charger now.
Going back to the format issue I raised earlier it works fine with th standard Geocaching use of DD MM.MMM just have to remembr to add in the n and w with spaces af follows:-
DD MM.MMM n DD MM.MMM w
I need to look into SmartGPX, thanks for the reminder Pooks.
Interesting article, Bear and Ragged, we will have to see what happens.