Originally developed for fighter jets and later modified for use in high-end luxury cars, so-called head-up displays project vehicle speed and other pertinent information onto the windshield in a driver’s line of sight. GPS maker Garmin recently introduced a portable navigation unit with its own head-up display to help reduce driver distractions and keep his or her eyes on the road.

Called HUD (for head-up display, naturally), the unit works with a Bluetooth enabled smartphone to cast navigation information onto a transparent film on the windshield or an attached reflector lens. The compact unit shows a wealth of data including driving directions, distance to the next turn, current speed and speed limit, estimated time of arrival and alerts the driver to potential traffic delays and speed/stoplight cameras ahead. This is all in addition to the usual spoken turn-by-turn instructions.

HUD is compatible with iPhone, Android or Windows Phone 8 units; it retails for $130 with the required mapping software priced at an additional $30.