SINOTRACKHUD Digital GPS Speedometer for Car Universal Heads Up Display Oversize Screen Large LCD MPH Speedometer Speed Fatigued Diving Alert Over-Speed Alarm Compass for All Vehicle

I'm glad I got it so I don't speed in the golf cart

You'll have to play around with the Vehicle Speed Settings to Adjust. Why? Not Sure.2-3 times... I've got it SPOT ON. The other Functions are Near Perfect.I use the Compass and Elevation Features. PERFECT.Takes about 3 minutes to find the Satellites (14-19 in my case.)Attractive. Mounts Well on slightly irregular planes. Tilts Back and Forth and Adjusts Horizon Plane to square up the Positioning. Tight and Easy.No FAULTS yet at all. The Instructions are "unintuitive"... you've got to play around with it on set-up.I'd buy again.J

Worked reliably and consistently going across the country. Not sure if it’s the nature of the gps network or the instrument but it reads about 3mph higher than actual speed anywhere above 40mph.

This is a pretty handy-to-have auxiliary instrument to have in almost any kind of motorized vehicle, because none of my motorized things have displays of ALL of the things this one provides. Examples:- My boats don’t have speedometers.- My cars don’t have altimeters.- My UTV doesn’t have a compass or altimeter.Because I often like to know these things, I have found this device handy as a supplemental readout.Speedometer accuracy seems quite good.A few things I’m not fond of, though:- The speedometer readout changes rapidly - so much so that it can be distracting.- I found it hard to set up because the instructions on which sequence of buttons to press was hard to follow.- It doesn’t attach firmly to anything except with double-stick tape, thus not as portable as I would have liked, e.g. like a portable GPS is.

The speed adjusts very quickly for a satellite speedometer. I had others that didn't work well at all compared to this one.