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The only ones I've found are from 1yachtua.com but they're not very accurate. You will need to calibrate them in Memory Map using the corner co-ordinates and ideally a number of other points (eg headlands). If you want something more accurate for the iPhone you could try the Imray or Navionics apps but I don't find them as easy to use as Memory Map.
Whichever you go for you could only really use them to get a general idea of where you are, log and review tracks etc but they will not in any way substitute for a proper chart or a purpose built marine GPS.
Also bear in mind that the iPhone doesn't like water, so it will need to be in a waterproof case, which could affect screen visibility.
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