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Please pardon my ignorance in asking this question, but having never used any GPS system before I'm clueless: I am planning on buying my first system so I went to the OnCourse site after reading your review, and cannot find any explanation of the choice between buying it on a 2 GB SD versus the slightly more expensive 4 GB SD.
Is the 4 GB version designed for someone that may want or need to save routes? And if so, does that mean mean the 2 GB version does not have enough room on the card for that at all, or just that it it doesn't have as much room?
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