I always carry a current chart. At the least, it comes in handy for planning purposes since you can see a larger area in full detail, all at once.
Remember to update your chip too. The islands and bridges dont move enough to make a diference but there are numerous other details that change over time. Current soft-ware will increase the effectivenss of whatever system you obtain.
I use S/H 150c. It's a little small but works fine.
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