What does it tell you that your display doesn't?
The biggest advantage is that a large digital display is quicker to read and, being gps-based accurate at all speeds.
e.g. my analogue speedometer is about 5mph out at higher speeds and a little less out at 20mph. Important as drifting over to just 24mph will get me points, a fine and increased insurance for the next 5 or 6 years....
Further, I can set it to change colour or sound an alert at/above certain speeds, so peripheral vision (or my ears) will let me know I've gone over.
Means I can concentrate on idiot drivers and pedestrians and stop glancing down at the speedo.
Full features are:
* Lite Mode (speed only) - swipe the speed left
* Altitude, show clock seconds
* Multiple Speed Warnings - have as many as you like. Set a colour, trigger speed, built-in/custom/no alert sound. Trigger on overspeed/underspeed (possibly one for the pilots)
* Set any background colour
* Profiles - create profiles for different activities or modes of transport and keep all their settings and values separate
* Pins - save locations you visit. Navigate there or view them in Google Maps later
* Log your routes and export to .KML, .GPX and .CSV file formats, or open in Earth if installed
* Day/Night mode - choose a different colour and brightness setting for day and night. Auto mode automatically switches at sunrise and sunset
* Edit speed and distance values, like odometer, trip and max
* Optional start/stop on power connected/disconnected
* Litespeed - switch to 'Lite mode' when you go over a chosen speed
* Speedtouch Lock - turn off all screen touch events over a chosen speed
* Elapsed time (tap the clock to switch, and again for the clock)
* Tap compass for simple compass, bearing and odometer (tap again for classic compass)
* Speed offset - adjust the displayed value by up to +/-20%
* Hide unlit number segments - make those empty digits less distracting
* Google Map view (swipe speed right)
* Choose the number of decimal places to show for values, up to two
* Speed can optionally be to one decimal place
* Compatible with Samsung's Multi-Window & LG's Dual-Window Modes