Hi RichinZ,
Is this only happening on iOS9?
You mentioned 2 things
1) Issue with Google map
2) Issue will All (?) iframes
For number 1, if your using a google map api in an iframe, that's almost certainly going to require remote access, and a network connection. For content to work offline, it has to be packaged entirely offline. This is not possible with google's map api, as it requires access to download scripts, css, and of course, the map data itself.
For number 2, are you saying ALL iframe content doesn't load when offline?
Please clarify,
Jamie