Difficult to download maps

Bought this app to help in accessing NOAA charts for florida/ Sanibel/Ft.Myers. I tried to download the Raster Maps and despite several hours of effort could not get them to work. To transfer from a MAC to an iphone was definitely an exercise in frustration, After 21/2 hours I gave up. I could not contact support and could not resolve the issue. For 29 it was indeed a waste of money. As I was going out in a boat the next day I searched a bit more and found an app by Navionics for$ 9.95. Up and running in 5 minutes an intuitive. Better value for the money and I did not need a PC/Mac to download the maps. The navionics was standalone where as Memory Map was not.
As I could not get it to work properly I cannot give anymore input to this program.

Katcupcake about Memory-Map, v1.4.3