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Hi, I have a Colorado 400i and love it.  I use it for the lake profiles and for backpacking.  My problem is that the user manual is a bit thin (in both senses of the word).  I asked Garmin to recommend a good book from which I can learn and understand some of the more advanced features.  I struck out there.  Is there a good book or user manual that is specific to this series of GPS units?  Barring that, is there a general book that would be helpful?  Thank you very much for the opportunity to post this question.