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Thanks for the help.

So if I wanted to have several states on my gpsr I would have to look for less detailed maps and download them all?

I loaded the topo maps for Nevada and California. They are 1.25 GB +/-
I was wondering how can garmin do the whole North America when this device only supports a 4 GB card?
Is this the only way to do that?
Thanks for the replies!

I just bought a Garmin 450. I am using it for geocaching with my family, I am confused on which maps are best or recommended for this. What if I want to do this in multiple states???