I use complicated software to do that, but there are a variety of methods. For small jobs, http://www.gpsvisualizer.com usually works, and is quite versatile.
1. Go to http://www.gpsvisualizer.com/convert...ert_format=gpx
2. Upload your marine reserves kmz file downloaded from the DOC FTP site.
3. Hit 'Convert'.
4. Save the resulting .gpx file and transfer it to your GPS. The outlines of the areas in the kmz file will become tracks on your GPS.
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