Of the two apps we use, Plan2Nav is the one that will also work on an iThing. Stand-alone free app (i.e., Internet not required except for updates), C-Map vector charts aren't too expensive, AC integration, etc.
The license allows you to run it on up to 3 devices, so we have it on two tablets and also on my phone... just in case.
-Chris
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Chesapeake Bay, USA
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