I probably can't help much with the 2610; I have a Garmin IQue3600. Based on that experience, which may or may not be applicable to you, I would be surprised if the card which came with the unit is sufficient for anything but a very small area. I currently use a 256K SD card, which will hold street-level data for maybe 4 to 8 states (depending, of course, on the size of the states).
I currently have on order a 2GB SD Card, which will accommodate the entire US and Canada. I am told that MapSource City Select v. 7, which I assume your unit uses as well, requires about 1.6 GB for the entire US/Canada.
If your unit uses different mapping software, disregard this post.
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