Why are dashcams becoming so popular? Quite simply, you can’t argue with video proof.

NavMan gave us their drive duo to take for a test drive, and it was mostly good news.We had a little trouble with power cord so ran it on batteries only. We put this down to user error.

It is easy to attach to the windscreen with a suction cup.

It has an adjustable front camera with a wide-angle glass lense. it is easy to set up. Just point the screen towards the driver, and twist the camera until it’s in the right spot.

The cam records in 1080p and has SD storage for easy transfer of files to the desktop software. Files can also be transferred by cable.

The $279 unit combines both Satnav and Dashcam in a single wide screen device. There is an optional rear camera for $139, and we’ll show you why that is essential at the end of the video. The rear camera is best professionally installed unless you want cables draped through the cabin.

The screen needs a firm touch but there is voice control if you’d rather not fiddle with screens. Like most voice controls, it can be temperamental. We tried inputting several directions but the system demands commands in a very particular format.

There are a host of features like: Bluetooth phone connectivity, spoken safety alerts, live traffic updates, 3D junction view with real signage, lane departure alert, collision alert, speed limit alert and GPS tracking.
You can store favourite addresses too.

Calls can be handled handsfree which instantly brings a car of any vintage into the 21st century.
You get lifetime map updates to ensure your device is always up to date.

Of course, much of this can be done with a mobile phone, but no phone will act as a dashcam, and navigation device which instantly records accidents even if the car is unoccupied at the time.

A reader sent us this footage last year using another brand of dashcam. Keep your eye on the truck in the rear view.

You can see from the ferocity of the impact that there was little doubt as to fault, but this footage sealed the deal with the insurer.