Review on Universal Car HUD Head Up Display - ACECAR Digital GPS Speedometer With MPH Speed, Compass, Fatigue Driving Reminder, Distance, Altitude, Overspeed Alarm And HD Display, Suitable For All Vehicles by Danny Lavimodiere

This unit works well and has just the features I was looking for:* speed* compass* automatic dimming* altitudePros:* easy-to-read 1" numeric speed display* uses USB (5V) power rather than 12V as some other units* compass is graphic and easy to read with all 8 directions* optional displays are each selectable: compass, speed "gauge" bar, number of satellites, blue numeric display* automatic dimming at nightCons:* speed "gauge" bar is not really usefulThis unit is small enough that it can just rest on the dash.

I needed a GPS speedometer because the instruments in my VW EuroVan are very hard to read in bright sunlight.