MacSailing.net

http://www.flytomap.com/index.html - $9.99

Search for "Water map navigator" in the AppStore.

This one looks like it needs a little more time in the oven.

Quote:There is NO WAY this program should be used for navigation, or really even trip planning, but it does provide a fairly cheap way to view the ENC charts on your phone. For anyone serious about iPhone navigation, this isn't worth your $10, at least not yet. Better to save your money for iNavX or the upcoming iNavX Version 2 (with Navionics vector charts).

Fly to Map - Water Map Navigator First Look