The depths and resolutions are great.
NOAA chart downloads:
http://nauticalcharts.noaa.gov/mcd/Raster/download.htm
Note: Go straight to bottom of web page and click download button.
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Maptech:
http://www.maptech.com/products/index.cfm
Go to Downloads at top of page, then choose Chart navigator 5.07 with NO maps.
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I will try to explain it easily from what I learned setting it up.
First, download Chart Navigator, and install it.
Then, you will go to the NOAA site and chose what charts you want. (One note here is it will help if you know thw chart #, because the graphical interface can be Slooooowwww at times)
NOAA will package the charts as .Zip files. You have to extract these zip files to the chart directory. Then Chart navigator will automatically recognize them.
Good Luck. I know some (like Chalk) already have it running, so we can help if you have problems. The main problem I see people having is they do not have the charts in the right directory .
You will love it once you get it running.
You can even print out chart areas to a color printer if you want.
Hooked
