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A quick summary of what I do includes

  1. Getting a screenshot of a depth map. I get mine from Navionics
  2. Import that image into a software where you can freehand the contours of the depths. I use SketchUp and I have access to the pro version which is important for the next step.
  3. Exporting those lines as a dxf
  4. Import that dxf to vcarve
  5. Make sure all vectors are closed
  6. Then scale, smooth, and do toolpaths
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