Not quite sure what you are saying there, but the 276C wasn't revolutionary or an order of magnitude greater than anything else in its time. It was just an improvement of the earlier 176, and the main improvement, if not the only improvement, was switching to a color screen. In at least one important way the black and white 176 was better. It was readable in bright sunlight without the backlight whereas the 276 is not. I would have just stayed with the 176 except I dropped it and after that there was a big blemish on the screen.
Here is the review of the Garmin 176, which came out in 2001, list price $571 PLUS speaker cable and maps etc.
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