How much can fit on a Garmin 512M data card?

Easy! you can fit 512m on a 512m card

CN2008 and Oz Topo piece of cake I would say. I have 56meg on my 60CS and can get almost half of Oz on it including all of Sydney, 200 at the most would pull up CN2008, that leaves all the rest for Oz Topo. Should be a doddle.

If you're worried just get a 1 gig card

Good GPS , I still think they are the best serious type GPS around.

Never really use my 512 card , 128mb is enough for eastern Australia with CN8 and Shonky.

Both would fit on my 256mb card

As downloading is pretty simple i prefer to keep 2 smaller cards for redundancy.

Hello

All of City Navigator 08 requires ~150mb
All of OztopoV2 (no contours) requires ~330mb
Total therefore is ~480mb

OztopoV2 contours require lots of space - all of Aus is 1,592mb so you will need to be a bit selective here.

60csx is possibly a better choice if you plan on just getting one gps and stepping out of the car. As "serious" as the 276 is (and it is a good choice for in car work) it becomes seriously useless out of the car.

Cheers
Greg