To change default map application in iPhone Apple Maps are very inaccurate. They costs my time and money when I use them by accident. 
I want to change the default app to Google Maps. 

How can you change the default Map application in the newest iOS to Google Maps?

I really would like to delete the Apple Maps from my phone.
You can't change the default app. Some apps give you the option to choose which app to open maps/directions in, but this varies per app and app developer. There is no system toggle and Safari/Siri/etc will continue to open maps in Maps.