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This gps has no internal memory, it relies on the original 128 microSD card, which I'm sure you have put somewhere safe. Each regular chart area takes up about 12-14MB of space.
You are right about changing out the microSD chips, I have already broken one. The problem is that the larger area you need (Maine through Chesapeake, Jan 08 (US600X) - 010-C0060-00) is only supplied on micro SD.
If you want the charts on CD (which is my preference) you are back to the regular format and you are looking at three possibly four charts ($150 +$100 x3). This makes no sense. With either option you are looking at $400+ for charts. The main benefit of the CD is that you can do all your planning on your PC. If your main GPS is also a Garmin this can be useful for planning purposes.
I would pass on the charts and just plot a number of emergency waypoints and keep a paper chart handy.
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