Three Offline GPS apps I used extensively on my iPhone are:
The first two have more options to work with, and signal acquisition and performance is very good, however they are both picture based maps - since you have to download the maps of where you are going to be prior to your trip, the phone works 100% independently of a cell network - it simply uses the GPS of the phone.
The last one Galileo is I find the best if you are traveling long distances as you can download your maps as Vector Maps for a country and it takes very little mb of space on your phone and allows you to zoom down to 10m, plus it allows unlimited tracks and waypoints and works very well.
Good Luck, let us know what you decide to use..
Cheers
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