While I have a Garmin in transit to me I poked around about GPS use and ones phone.
Here is what I understand but not sure if I am right. The Phone uses the internet to obtain the map of where you are and where you are going. Once that is obtained then it uses the GPS ability on the phone itself to determine your location. So it's only when it obtains the map(s) for where you are and where you are going that uses data/Internet.
Now assuming I understand that right, that leads me to other questions:
1. About how much data usage is that? If you don't have unlimited data would that break the bank sort of speak?
2. Can you download maps for your entire state and another and not have to download again unless you want it update?
3. What do you use? Google Maps or whatever?
4. I currently have 2 phones: IPhone 5S (personal) and Samsung Galaxy S5 (work). But I been told Windows Phone is better for this.
Anyone with hands on knowledge or/and a deep understanding for this please assist.