Data volume of a map of the US

Factual Questions
1

For a Garmin GPS-like device, how much memory is required to store a map of the streets of the continental United States?

2

You can look at the Garmin Online Store. It looks like 1.75 GB for the lower 49 states
http://buy.garmin.com/en-US/US/p/28765#requirements

3

It’s around 2.5GB. From this discussion.

4

Thanks. Question answered.