A windshield head-up display, or HUD, is a beautiful thing. Capable of displaying navigational guidance, vehicle speed, and other information on the lower part of the windshield and in the driver’s line of sight, HUD systems have become increasingly common on new cars since their first appearance a couple of decades ago.

More recently, a handful of aftermarket suppliers and startups have gotten on the bandwagon, offering devices that pair with a smartphone via Bluetooth to provide similar functionality, even if these devices lack the seamless integration of a factory system.

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