[QUOTE=rm -rf;19698697]osmand
If you have a smartphone or tablet, using Android, the free or low cost Osmand lets you download regional maps and store them on the device. Then you just need a GPS signal.

Thanks rm,
I am familiar with OSMand. In fact I've been using it in the car and on the bike for the last couple of years. Actually, my current quest is because I've decided that as good OSMand is, I'd like a dedicated navi device for backup.

For love nor money I cannot upload gps tracks to OSMand on my tablet!
And in the situations when I do take it out to plot a route the conditions make using a tablet less than convenient - picture rain, wind, darkness, dodgy road conditions!
I did try just following the voice commands through a headphone..... I wouldn't recommend it :-) Certainly not in a city!
If my specific GPS unit search comes up negative, then I'll look at OSMand again. It would probably make more economical sense to buy a dedicated phone/holder/protective case just for navigation.