First off, they are different. The only similarity is you look for something. They are NOT the same, and SHOULD NOT be combined. There are many cachers-both who do the Munzee thing, and who don't, who will agree.
I do believe when looking at the cache map on Iphone it uses apple maps. From the home screen select find nearby geocaches. You will either get a map, or a list. At the top of the screen you have two buttons. One for map, and one for list. Simply select which one you want. And just to point out, the driver shouldn't be using a cellphone while driving. It is even illegal in some places. That's why it's a good idea to plan your route when you select the cache you want to find. Or at least have someone to navigate for you.
Using a cell phone in the car is illegal in most places, but using a GPS is not. I use the GPS on my cell phone in my car while driving often and so do emergency responders. The turn by turn features would be awesome so you can drive and get closer, I am NOT talking about texting or playing games.
As for the Munzee, you points are very valid. I am a newbie and just seeking some advice on advancing in this hobby. Thanks for the suggestions.