EDIT: This is now a confirmed bug with this SDK
I\'m using version 1.1.1.2311 of the Google Maps for iOS SDK, and I\'m looking to find the bounding latitude and long
Looks like the latitude and longitude coordinates you are printing out and manually plotting are possibly off a bit / being truncated. %f defaults to only print out to 6 decimal places.
Here's a related question that might help:
How to print a double with full precision on iOS?