I have been using a similar solution which predates the availability of the IOS app. I purchased a pdf bizer chart for $25 or so (back in 2008), and converted it to the NOAA BSB format. That let me use any number of apps that use the free NOAA RNC charts - my current favorite is iNavX. I was doing this for boating on the ocean anyway, so it was convenient that the Winni chart showed up as one more chart on the list. YMMV.
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