A dedicated dash-mounted navigation system feels like a throwback in the age of the smartphone, and the problem is that the phone, for all its brilliance, is not actually designed to be a dashboard instrument. For drivers who spend long hours on unfamiliar roads, a purpose-built navigation unit still earns its place, and knowing which features justify the purchase is the key to not wasting money on a redundant gadget.The features that make a dash unit worth buying are the ones the phone does poorly. A screen that stays bright and readable in direct sunlight, a display large enough to glance at without squinting, and maps stored on the device so it never loses its route when the signal drops. A unit that also handles live traffic, either through a connected app or a receiver, closes the gap with the phone, and a clean, simple interface designed for driving rather than for a dozen other tasks is the quiet advantage that matters over hours.The reasons not to buy are just as real.
The maps need periodic updates, the interface rarely feels as
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