Best bathometric charts for North Carolina offshore and TZT3 12?

I looked at everything that was available and just stayed with the free charts that are installed. None of the paid charts that were available had any better data for my area - mostly offshore Cape Lookout area. To be fair, I have not looked again in a couple of years but I don't think much has changed. The free charts are accurate and work great, but certainly not as much detail or fancy looking in terms of bathymetry as what you see with the Navionics charts, etc.
 
I would recommend the C-map bathy chart for the east coast (MM3-FNA-022) as it is relatively cheap ($100) and covers bathy in more shallow areas and a few gap areas that the free fishing chart does not.
 
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