Sat Nav around the world trip

[and3h]

Hi, looking for a bit of advise. I'm heading on one of these round the world trips for 6 months in 3 weeks. I'll be hiring a car in California, and probably a camper van in NZ and Oz, also possibly a car in South Africa.

I reckon the car hire company's will charge a bomb to include a GPS, so is it worth getting a cheap tomtom now and loading it up full of hacked maps?

I've seen a cheap tomtom one v2 for £58. Thoughts?

Do I need a separate sd card for each map or can I put many onto one card?

Thanks for any advise,, I'm well excited but there is so much still to do and I'm not the most organised person.

[Russ]

Not sure what the max size card you can use is on a v2 One (I can use a 2gb in my Go500), but you can put many maps onto one card.