GPS Speedometer C80

Very visible, accurate. Fairly easy to install. Reasonable affordability. I use it inside a golf cart in a share the road circumstance. You can have it buz z to warn you that you have achieved too high a rate of speed. Minor , minor thing, it's usb port is not usbC, it uses USB mini. That is not a real issue, perhaps not worth mentioning. I am very satisfied, I use them and recommend them to people in my community.

Someone else wrote that their mother-in-law was older and needed something better to see the speed. I ordered for the same reason even more so because I only have one eye and this certainly is big and bright for me. Truly a blessing. I feel much more comfortable in my 2010 Ford Explorer not having to try seeing what the regular speedometer is reading! I barely take my eyes (eye) off the road.

It takes a long time for this thing to latch on to satellites, like 3 minutes sometimes even more. However, once that's done it works fine. If you hit the brakes real hard you'll see that it's a bit slow to react, but under normal circumstances it's all OK.

Speedometer works Great. Altitude (in Meters) not so much. Customer Service was GOOD. very responsive and courteous. They wanted to make sure i was happy. My 3rd unit works great. I have an older cargo van to haul my dirtbike. the speedo is inconsistent. Because I drive on the highway, I need to know my speed. Don't want a meeting with CA Highway Patrol! I tuned the unit while also using the App waze. this unit is very consistent! I placed the unit in front of my speedo in the van so I don't need to divert my eyes far from the road. The character height is great. Day or night, No visibility problems!! you can leave it on full time or turn it off. Altitude is an indicator, but not accurate. I don't care for the beep that happens every hour.

Set up with my truck on cruise control and was accurate +/- 1 mph.

UPDATE: Can't seem to adjust speed (still 2 MPH over) - press twice and get 002 but can't change, just changes to 001 (up) or 003 (down), not the speed calibration. Adjusted altitude all the way down and still shows way too high - like 900m too high, turned off that display. Since I only need it at night (and seldom drive at night), at least I have a barely acceptable speedometer. There has GOT to be better devices for the price. First impression: not worth the money. Speed was 6MPH high. According to the manual, I might be able to adjust (from 'default' can adjust +2.5 to -9 MPH). Altitude was WAY off, at 300 feet (91m) reads 1418m - and doesn't look like it can be 'calibrated' enough. Per manual, can only be adjusted from 'default' +500m to -500m. I have an old (20 years old) Magellan SporTrak that is more accurate without 'calibration'... and only has a 3m accuracy. Most current smart watch have much better accuracy (1m). Overall, I may be able to 'calibrate' the speed to something useful, but not the altitude.

Its a bit slow. Thats just how gps it though, takes a while to grab hold of a satilte to function. Im using this in a maf max car im building so i don't have to deal with speedo calibration on a car with out a changeable speedo gear. Works good enough so far. I paid 25$ id like to see it priced lower though honestly 20 would be fair.

Accuracy is bad since I have it at the lowest setting and is still not correct, but close enough. God visibility for older folks like my mother inlaw.

Works well to correct manufacturers in-built speedo error. Set GPS HUD to 0 for an accurate speedo reading. Check out John Kadogan (YouTube) comments on speedo errors.