The sensitive type The Navman N40i ($449.95) offers reasonably clear and detailed maps along with an intuitive interface. Route finding and recalculations are accurate and fast. The N40i is the only one of the four units to include exterior buttons for volume control, one-touch access to nearby gas and parking options and the like. The buttons compensate to some extent for a hypersensitive touchscreen that is apt to process two clicks when only one is intended.
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