Actually 1 gigabyte (GB) is 1,000,000,000 bytes. The 1,073,741,824 measurement you're referring to is actually a gibibyte. (GiB) These are IEEE's standards, not Apple's.
However, if Apple continues to list the capacity in GiB, they really should label it as such, or go the other route and convert the number to actual gigabytes (which is how they're erroneously labeling it). Otherwise people will keep getting confused.
Snow Leopard introduced proper GB measurements after all, they should really incorporate it into iOS.
Learn something new every day. I wasn't aware this was an industry standard, not just apple. Thank you for the info