The Wiiyii C1 heads-up display is a two-for-one that can integrate data from the vehicle's on-board diagnostics and its own GPS receiver. This allows the HUD to display data on the road. The device is a great way to see what's going on in the car without taking your eyes off the road, but it still lacks the ability to add data from your cell phone or display turn-by-turn directions. Still, the $56 price is a bargain.

One of the best deals in heads-up display technology, the Wiiyii C1 offers something worth the $56 price tag. The company also sells a variety of direct-view assistive instruments.

At about half the size of the Hudway Drive, Wiiyii has managed to pack a lot of automotive technology into the C1 heads-up display.Also known as the OBD + GPS heads-up display, the C1 measures 4.3 x 5.0 x 3.5 inches in a matte black plastic case. Unfortunately, there is no Drive's foldable base extension that provides a more solid connection to the dashboard. It weighs 4.4 oz.

Like the Drive, the Wiiii C1 has a 1.8-inch color LCD screen that projects images onto a recessed plastic screen. While the projector cannot project images onto the inside of the windshield, it worked well during daytime and nighttime use. When not in use, the unit folds down to a thin 1.7 inches.

The unit comes with an on/off switch and a control button that lets you adjust what the device is projecting. It can display more than a dozen items, from engine and vehicle speed to air/fuel ratio, turbocharger pressure, and diagnostic fault codes.

It also displays alerts for excessive speed, low battery voltage, and hot coolant. Sadly, this design is not linked to the phone.

Wiiyii says all cars should be able to use the C1 HUD. The logic is that the unit can rely on a stand-alone GPS receiver even if the on-board diagnostic connection does not work.

Included in the box was a 12-volt accessory adapter and cable to power the GPS module alone. In my case, its installation began with plugging the OBD module into the car's diagnostic port. The unit does without the stick-on wire guide on the Hadway drive, but the OBD cable was flat enough to squeeze into the gap in the dashboard.

The head-up display immediately lit up, showing a speedometer with large numbers in its default design. It was easy to mix numbers and graphics, with the speed in the center and a visual bar graph on the side showing specs such as voltage and engine temperature.

The OBD screen, which is all text, looks like it was taken out of a scanner. However, it is functional and displays a list of items and their current operating values and faults.

The Wiiyii C1 was secured with the included adhesive mat and fit nicely on the dashboard. However, it was dislodged by a large impact, so those who often travel on roads that are not smooth should keep this in mind. Included with the unit is a synthetic cleaning cloth, a one-year warranty card, and a six-page manual explaining how to get started using it.

After plugging the C1's OBD plug into the port on my 2014 Audi A4 Allroad, it immediately connected with the GPS satellites and began displaying data. It was also able to track changes in driving conditions, such as speeding up and braking.

The built-in GPS means that the C1 can perform acceleration and braking tests, but it still lacks a phone link - meaning you can't get turn-by-turn directions like those on Hadway Drive.

It is tall enough to not interfere with the driver's forward vision and is less obtrusive than other HUDs like the Drive and Pyle PHD180BD. Still, the Wiiyii C1 is a great way to get data on the road while driving.

If you're on a tight budget and want to augment your car's myriad of gauges with a heads-up display, the Wiiyii C1 will do the trick. The unit features a powerful projector, a built-in screen, and the ability to pull information from both the car's on-board diagnostics and GPS.

However, while the Wiiyii C1 can display a variety of information, it unfortunately cannot be linked to a smartphone. It also has a tall design that, depending on its position on the dashboard, can obstruct forward visibility. Still, it may be the best $56 you can spend on your car.